Terms

The Olney Notes (Olney Interpretation) were part of Secretary of State Richard Olney’s response to the Venezuela-British Guiana boundary dispute in 1895. Olney invoked the Monroe Doctrine, asserting that the U.S. had the right to intervene in Western Hemisphere affairs and warning Britain to stay out of Latin American disputes. This marked a more aggressive interpretation of the Monroe Doctrine and reinforced U.S. dominance in the region.

Pago Pago

A strategically located harbor in present-day American Samoa, Pago Pago was acquired by the U.S. in 1878 as a coaling and naval station. It played a critical role in America's expansion into the Pacific, serving as a fueling stop for ships and later as a military base. Pago Pago’s significance grew with the rise of American imperialism, as it provided a foothold in the Pacific alongside Hawaii and the Philippines.

"Yellow Press" or "Yellow Journalism"

A sensationalist style of journalism that emerged in the late 19th century, particularly associated with newspaper publishers William Randolph Hearst and Joseph Pulitzer. Yellow journalism exaggerated or fabricated stories to stir public emotions, notably contributing to pro-war sentiment before the Spanish-American War by blaming Spain for the USS Maine explosion. The press played a crucial role in rallying American support for intervention in Cuba and the Philippines.

de Lôme Letter (1898)

A private letter written by Spanish Ambassador Enrique Dupuy de Lôme, in which he criticized President William McKinley as weak and indecisive. When the letter was intercepted and published by Hearst’s newspapers, it inflamed American public opinion against Spain. The letter contributed to tensions leading up to the Spanish-American War by portraying Spain as dismissive of U.S. power and diplomacy.

USS Maine (1898)

A U.S. Navy battleship that mysteriously exploded in Havana Harbor on February 15, 1898, killing 260 American sailors. The exact cause of the explosion remains debated, but at the time, the press and public blamed Spain, fueling calls for war. "Remember the Maine, to Hell with Spain!" became a rallying cry, leading to the Spanish-American War.

New York World / New York Journal

Competing newspapers owned by Joseph Pulitzer and William Randolph Hearst, respectively, both engaged in yellow journalism. These papers sensationalized events in Cuba, particularly Spanish atrocities, to garner American sympathy and encourage intervention. Their exaggerated reporting played a crucial role in mobilizing public support for the Spanish-American War.

Jingoes

A term used to describe extreme nationalists who advocated for aggressive foreign policy, particularly in support of war and imperial expansion. The term became popular during the late 19th and early 20th centuries, as pro-war advocates pushed for U.S. intervention in Cuba and the Philippines. Jingoes were instrumental in promoting American imperialism and military expansion.

Teller Amendment (1898)

Passed as part of the U.S. declaration of war against Spain, the Teller Amendment stated that the U.S. would not annex Cuba after winning the war. It was meant to reassure anti-imperialists that America was fighting for Cuban independence, not territorial expansion. However, despite this promise, the U.S. maintained control over Cuba through the Platt Amendment.

Wilson-Gorman Tariff (1894)

A tariff that slightly reduced U.S. tariff rates but imposed a high duty on sugar, significantly impacting Cuba’s economy. The tariff hurt Cuban sugar planters, contributing to economic distress and fueling the Cuban revolt against Spanish rule. It indirectly played a role in leading to the Spanish-American War, as economic hardship heightened tensions between Cuba and Spain.

Rough Riders

A volunteer cavalry regiment led by Theodore Roosevelt during the Spanish-American War, the Rough Riders gained fame for their charge up San Juan Hill in Cuba. Comprised of cowboys, miners, and college athletes, they became a symbol of American bravery and Roosevelt’s leadership. Their success helped Roosevelt rise to national prominence, leading to his political career.

Foraker Act (1900)

A U.S. law establishing civilian government in Puerto Rico following the Spanish-American War. It allowed Puerto Ricans limited self-government but denied them full U.S. citizenship. While it marked an end to direct military rule, it also reinforced U.S. colonial control over Puerto Rico, leading to continued debates over its political status.

Platt Amendment (1901)

A U.S. law that severely restricted Cuba’s sovereignty after the Spanish-American War. It allowed the U.S. to intervene in Cuban affairs, required Cuba to lease land for naval bases (e.g., Guantanamo Bay), and prevented Cuba from signing treaties that might threaten U.S. interests. Though Cuba was nominally independent, the amendment made it a U.S. protectorate.

Philippine-American War (1899-1901)

A brutal conflict between the U.S. and Filipino revolutionaries who had fought against Spain and now resisted American rule. Led by Emilio Aguinaldo, Filipino fighters waged a guerrilla war against U.S. forces. The war resulted in significant casualties—over 200,000 Filipino deaths—and exposed the hypocrisy of American imperialism. The conflict officially ended in 1902, but resistance continued for years.

"Open Door" Policy (1899)

A diplomatic policy proposed by Secretary of State John Hay, advocating for equal trade access in China for all foreign nations. It aimed to prevent European powers and Japan from establishing exclusive control over Chinese markets. The policy reflected American economic interests in Asia and laid the groundwork for future U.S. involvement in China.

Boxer Rebellion (1899-1901)

An anti-foreign, anti-Christian uprising in China led by a nationalist group known as the "Boxers." They sought to expel Western and Japanese influence from China. A coalition of foreign powers, including the U.S., intervened militarily to suppress the rebellion. The aftermath strengthened foreign control over China but also fueled Chinese nationalism.

Pan-American Congress

A series of conferences promoting economic cooperation and trade among Western Hemisphere nations, led by the U.S. The goal was to strengthen U.S. influence in Latin America and counter European presence. Though Latin American nations often viewed it skeptically, it laid the foundation for future diplomatic and economic ties.

Influence of Sea Power upon History (1890)

A book by naval strategist Alfred Thayer Mahan, arguing that national greatness depended on naval supremacy. Mahan’s ideas influenced U.S. imperialism, encouraging the expansion of the navy, acquisition of overseas bases, and control of strategic waterways. His theories directly impacted U.S. foreign policy, leading to the annexation of Hawaii and the construction of the Panama Canal.

Portsmouth Conference (1905)

A peace conference mediated by Theodore Roosevelt to end the Russo-Japanese War. Roosevelt brokered a treaty that favored Japan but prevented either side from gaining too much power. His role in the negotiations earned him the Nobel Peace Prize, marking the U.S. as an emerging global diplomatic power.

"Big Stick" Diplomacy

A foreign policy approach associated with Theodore Roosevelt, based on the idea of negotiating peacefully while maintaining a strong military presence. The phrase "speak softly and carry a big stick" encapsulated this strategy, which was evident in the construction of the Panama Canal and U.S. interventions in Latin America.

Roosevelt Corollary (1904)

An extension of the Monroe Doctrine, asserting that the U.S. had the right to intervene in Latin America to maintain stability and prevent European interference. The policy justified numerous U.S. military interventions in the region and reinforced America’s role as a hemispheric police power.

  • "Dollar Diplomacy" – This was a foreign policy strategy used primarily by President William Howard Taft. It aimed to extend American influence by using economic power, particularly through investment in Latin America and East Asia. The policy sought to replace military intervention with financial investment to stabilize foreign nations and expand U.S. commercial interests.

  • Panama Revolt (1903) – This event refers to the U.S.-backed revolution in Panama against Colombia, leading to Panama’s independence. The U.S. supported the revolt to gain control over the land needed for the construction of the Panama Canal. Following the successful revolt, the U.S. signed a treaty with the new Panamanian government, securing rights to build and control the canal.

  • Insular Cases – A series of Supreme Court rulings between 1901 and 1905 that determined the status of U.S. territories acquired after the Spanish-American War. The decisions stated that full constitutional rights did not automatically extend to territories such as Puerto Rico, Guam, and the Philippines. These rulings justified American colonial rule by arguing that some territories were not yet ready for full self-governance.

  • Clayton-Bulwer Treaty – An agreement between the U.S. and Britain in 1850 that aimed to prevent either nation from exclusively controlling a canal in Central America. However, it was later superseded by the Hay-Pauncefote Treaty in 1901, which allowed the U.S. to construct and control the Panama Canal. The treaty symbolized early U.S. efforts to expand its influence in the Western Hemisphere.

  • Hay-Pauncefote Treaty – Signed in 1901 between the U.S. and Britain, this treaty nullified the earlier Clayton-Bulwer Treaty. It granted the United States the exclusive right to build and control the Panama Canal without British involvement. This agreement marked a major step in the expansion of American influence in Latin America.

  • "Watchful Waiting" – A term associated with President Woodrow Wilson’s policy toward Mexico during its revolution. Instead of immediately intervening in Mexican affairs, Wilson chose to observe developments before taking action. However, the policy ended when the U.S. sent troops into Mexico in response to border conflicts, particularly during the expedition against Pancho Villa.

  • "White Man’s Burden" – A phrase from a poem by Rudyard Kipling that justified imperialism by portraying it as a noble duty. The idea suggested that Western nations, particularly the U.S. and Britain, had a responsibility to "civilize" non-Western peoples. This concept was widely used to defend U.S. expansion into territories like the Philippines.

  • Panic of 1907 – A severe financial crisis that led to bank runs and economic downturns in the U.S. The crisis exposed weaknesses in the banking system and led to reforms that eventually resulted in the creation of the Federal Reserve in 1913. J.P. Morgan, a powerful financier, played a key role in stabilizing the economy by organizing bailouts for struggling banks.

  • Revenue Act of 1916 – This law significantly increased income taxes to help fund U.S. military preparedness efforts before entering World War I. It introduced higher tax rates for the wealthy and implemented an estate tax. The act was part of broader efforts to shift the U.S. economy toward wartime production.

  • Lusitania – A British passenger ship that was sunk by a German U-boat in 1915, killing 1,198 people, including 128 Americans. The incident outraged the American public and increased anti-German sentiment, pushing the U.S. closer to entering World War I. Although the U.S. did not immediately declare war, the sinking of the Lusitania contributed to tensions that led to U.S. involvement in 1917.

  • "He Kept Us Out of War" – A slogan used by President Woodrow Wilson during his 1916 reelection campaign. It emphasized his efforts to maintain U.S. neutrality during the early years of World War I. However, shortly after his reelection, the U.S. entered the war in April 1917 due to German unrestricted submarine warfare and other factors.

  • Zimmerman Telegram – A secret diplomatic message sent by Germany to Mexico in 1917, proposing a military alliance against the U.S. In exchange, Germany promised to help Mexico regain territories lost in the Mexican-American War (Texas, Arizona, and New Mexico). The British intercepted and revealed the telegram, which helped turn U.S. public opinion in favor of joining World War I.

  • Armed Neutrality – A policy adopted by the U.S. before entering World War I, where the nation remained officially neutral while preparing its military defenses. Wilson sought to protect American shipping from German U-boat attacks without formally engaging in the war. However, continued attacks on U.S. ships forced Wilson to abandon neutrality in 1917.

  • American Expeditionary Force (AEF) – The U.S. military force sent to Europe in World War I, commanded by General John J. Pershing. The AEF played a crucial role in major battles, including the Meuse-Argonne Offensive, which helped bring about Germany’s defeat. American troops provided much-needed reinforcements to the exhausted Allied forces.

  • War Industries Board (WIB) – A government agency created in 1917 to coordinate war production and supply distribution. Led by Bernard Baruch, the WIB regulated industries to maximize efficiency and prioritize military needs. The agency played a key role in mobilizing the U.S. economy for war.

  • Food Administration – A government agency led by Herbert Hoover that encouraged food conservation during World War I. It promoted voluntary measures such as "Meatless Mondays" and "Wheatless Wednesdays" to ensure sufficient supplies for soldiers and allies. The agency successfully prevented food shortages and increased U.S. agricultural exports.

  • Creel Committee (Committee on Public Information) – A government propaganda organization led by George Creel that promoted support for World War I. It used posters, films, and speeches to encourage patriotism and war bonds purchases while portraying Germany as a villain. The committee helped shape public opinion but also contributed to anti-German sentiment in the U.S.

  • Espionage Act – Passed in 1917, this law made it illegal to interfere with military operations, support U.S. enemies, or obstruct recruitment efforts during wartime. The act was used to suppress dissent against the war, leading to the imprisonment of figures like socialist leader Eugene V. Debs. It was later expanded by the Sedition Act of 1918.

  • Sedition Act – A 1918 extension of the Espionage Act that made it illegal to criticize the U.S. government, Constitution, or military during wartime. The law was used to silence anti-war activists, socialists, and critics of Wilson’s administration. Many saw it as a violation of First Amendment rights, and it was later repealed.

  • "Liberty Cabbage" – A term used in the U.S. during World War I as part of anti-German sentiment. Sauerkraut, a German food, was renamed "Liberty Cabbage" to avoid associations with Germany. Similar renaming efforts occurred with other German-related words and products.

  • "Peace Without Victory" – A phrase used by President Wilson in a speech advocating for a fair and lasting peace after World War I. He argued that punishing Germany too harshly would only lead to future conflicts. However, the Treaty of Versailles imposed severe penalties on Germany, contradicting Wilson’s vision.

  • "War and Peace to End All Wars" – A phrase used to describe the hopeful goal of World War I, which was seen as a fight to make the world safe for democracy. Wilson and other leaders hoped that the League of Nations and diplomatic efforts would prevent future conflicts. Unfortunately, harsh treaty terms and unresolved tensions led to World War II.

  • Battle of St. Mihiel (1918) – This was a major battle during World War I, where the American Expeditionary Force (AEF), led by General John J. Pershing, launched its first independent offensive. It took place in September 1918 and resulted in a decisive victory for the Allies, weakening German positions in France. The battle demonstrated the growing strength of American forces and their ability to conduct large-scale operations.

  • Central Powers – The alliance of Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria during World War I. They fought against the Allied Powers and suffered significant losses due to prolonged warfare and economic hardships. The Central Powers ultimately surrendered in 1918, leading to the Treaty of Versailles.

  • Allied Powers – The coalition of nations, including Britain, France, Russia (until 1917), Italy, and later the United States, that fought against the Central Powers in World War I. The Allies benefited from superior resources, manpower, and U.S. intervention, which helped turn the tide of the war in their favor. Their victory resulted in major territorial and political changes across Europe.

  • "Big Four" – The four major leaders at the Paris Peace Conference in 1919: Woodrow Wilson (U.S.), David Lloyd George (Britain), Georges Clemenceau (France), and Vittorio Orlando (Italy). They played key roles in negotiating the Treaty of Versailles, determining post-war settlements, and shaping the future of Europe. Wilson pushed for his Fourteen Points and the League of Nations, but the final treaty heavily punished Germany.

  • League of Nations – An international organization proposed by President Wilson as part of his Fourteen Points to prevent future wars through diplomacy. It was established by the Treaty of Versailles in 1920 but was weakened by the U.S. Senate’s refusal to join. Without U.S. participation and with growing tensions in Europe, the League ultimately failed to prevent World War II.

  • "Irreconcilables" – A group of U.S. senators who strongly opposed the Treaty of Versailles and U.S. membership in the League of Nations. They feared that joining the League would entangle the U.S. in future foreign conflicts. Their opposition contributed to the Senate’s rejection of the treaty, preventing U.S. involvement in the League.

  • Palmer Raids – A series of government raids in 1919-1920, led by Attorney General A. Mitchell Palmer, targeting suspected radicals and anarchists. These raids occurred during the Red Scare, a period of intense fear of communism following the Russian Revolution. Many immigrants and labor activists were arrested and deported, often without fair trials.

  • Red Scare – A widespread fear of communism and radical leftist movements in the U.S. following World War I. The fear was fueled by the Russian Revolution, labor strikes, and anarchist bombings. The government responded with crackdowns, including the Palmer Raids, and increased restrictions on immigrants.

  • Sacco-Vanzetti Case – A controversial trial in which two Italian immigrants, Nicola Sacco and Bartolomeo Vanzetti, were convicted of robbery and murder in 1921. Many believed they were targeted for their anarchist political beliefs rather than solid evidence. Their execution in 1927 sparked protests and remains a symbol of injustice during the Red Scare.

  • "Great Migration" – The mass movement of African Americans from the rural South to northern cities between 1916 and 1970. It was driven by economic opportunities in industrial jobs, escape from racial segregation, and the need for workers during World War I. The migration reshaped demographics and contributed to the growth of Black communities in cities like Chicago, New York, and Detroit.

  • Isolationism – A foreign policy approach in which a country avoids political and military involvement in international affairs. After World War I, many Americans supported isolationism, leading to the rejection of the League of Nations and restrictive immigration laws. This policy remained strong until the U.S. entered World War II.

  • U-boats – German submarines that played a significant role in World War I, particularly in unrestricted submarine warfare. They targeted Allied and neutral ships, including the Lusitania, which contributed to the U.S. joining the war. The development of anti-submarine tactics helped counter their threat.

  • National Defense Act (1916) – A law that expanded the U.S. military in response to rising tensions before entering World War I. It increased the size of the National Guard and improved military preparedness. This act was an important step in strengthening U.S. defense capabilities.

  • Proclamation of Neutrality – A formal declaration by President Wilson in 1914 stating that the U.S. would remain neutral in World War I. Despite efforts to avoid involvement, U.S. economic ties to the Allies and German provocations eventually led to U.S. entry into the war in 1917.

  • Liberty Bonds – War bonds sold by the U.S. government to finance military expenses during World War I. The government encouraged citizens to buy bonds as a patriotic duty, raising billions of dollars. This method of war financing was critical to supporting the war effort.

  • Selective Service – The system for drafting soldiers into military service, established by the Selective Service Act of 1917. The act required men between the ages of 21 and 30 (later expanded) to register for the draft. It allowed the U.S. to quickly build an army for World War I.