World War II Comprehensive Study Guide: Strategies, Homefront, and Postwar Consequences
The Battle of Midway and the Transformation of the Pacific Theater
Date and Duration: The Battle of Midway occurred between June 4 and June 7, 1942.
Japanese Strategic Objectives: A primary objective for Japan during World War II was the removal of the United States as a Pacific power. This was intended to facilitate Japanese territorial expansion within East Asia and the various islands of the southwest Pacific.
Initial Engagement (June 4): Early in the morning, aircraft launched from four Japanese aircraft carriers conducted an attack on the U.S. base situated on Midway Island, resulting in severe damage.
Counter-Offensive and Conclusion: Over the following two days, U.S. forces stationed at sea and on the island maintained continuous attacks. These efforts forced the Japanese military to abandon the engagement and retreat.
Historical Significance: This victory was a critical turning point in the Pacific theater. It halted Japanese expansion and allowed the United States to transition to an offensive strategy characterized by a years-long series of island-hopping invasions and naval engagements designed to shrink the Japanese empire.
Strategic Planning and the War in Europe
Roosevelt-Churchill Alliance: Immediately following the bombing of Pearl Harbor, President Roosevelt invited British Prime Minister Winston Churchill to the White House. Churchill arrived on December 22, 1941, and collaborated with Roosevelt and his advisors for three weeks on war strategy.
Strategy of Europe First: Churchill successfully convinced Roosevelt that Germany and Italy represented a more significant threat than Japan. Consequently, the Allies decided to strike Hitler first, delaying a full resource commitment to the Pacific until the European front was secured. This also allowed the U.S. Pacific Fleet, which was largely destroyed in the Pearl Harbor attack, to be rebuilt.
The Battle of the Atlantic: - In the first four months of 1942, German forces sank 87 Allied ships off the Atlantic coast. - By the seventh month of the year, German “wolf packs” (groups involving ships and submarines) had destroyed a total of Allied ships. - Allied Countermeasures: The Allies organized cargo ships into convoys. These were escorted by destroyers utilizing Sonar (Sound Navigation Ranging) for underwater detection. Aircraft also accompanied convoys, utilizing Radar (Radio Detection and Ranging).
Operation Overlord and the Liberation of Europe
Planning for Invasion: In 1943, plans were initiated to invade France to liberate Western Europe from Nazi control.
Command and Forces: American General Dwight D. Eisenhower was appointed commander of the operation. He oversaw the gathering of nearly British, American, and Canadian troops in England, along with extensive military supplies.
D-Day (June 6, 1944): Code-named Operation Overlord, the invasion targeted Normandy in northern France. - Initial Assault: Shortly after midnight, three divisions parachuted behind German lines. - Seaborne Invasion: In the early morning, seaborne soldiers (U.S., British, and Canadian) landed. - Outcome: Despite heavy casualties, Allied forces secured the five targeted beaches by the end of the first day, marking a major turning point in the war.
Breakout and Liberation of Paris: On July 25, General George Patton and his Third Army began advancing toward Paris. By August 25, French resistance forces and American troops liberated the city from four years of German occupation.
Advance to Berlin: By September 1944, the Allies freed France, Belgium, and Luxembourg. On April 25, 1945, the Soviet army captured Berlin, the German capital. Adolf Hitler and his top advisors committed suicide in a bunker to avoid consequences.
Victory in Europe (V-E Day): General Eisenhower accepted the unconditional surrender of the German Army. Victory in Europe Day was celebrated on May 8, 1945.
The Pacific Front and the Philippines Campaign
Shipbuilding Expansion: The U.S. launched an accelerated shipbuilding program. By early 1943, production reached Liberty ships (cargo and troop transport) per month, many produced in the Bay Area. Allied ship production eventually began to outpace sinkings.
Surrender of the Philippines: Created in July 1941, the US Army Forces in the Far East (USAFFE) consisted of approximately Filipinos and U.S. soldiers. On April 9, 1942, they were forced to surrender to the Japanese due to a lack of Allied support.
Bataan Death March (July 1942): Approximately Filipino and American Prisoners of War (POWs) were forced to march miles through the jungle to a prison camp. Prisoners suffered from starvation, lack of water, and absence of medical care in tropical conditions.
Liberation: The Philippines were liberated by the U.S. military in February 1945 and granted independence in 1946.
Late Pacific Battles: - Iwo Jima (February–March 1945): Resulted in killed and wounded. - Okinawa (April–June 1945): Resulted in Marines killed and Marines wounded. - These victories cleared the path for a potential invasion of the Japanese mainland, though leaders anticipated massive U.S. casualties due to the determination of the Japanese military and citizenry.
Mobilization and the Homefront
The War Powers Act: Following the declaration of war in December 1941, Congress passed this act, granting President Roosevelt unprecedented control over war efforts. This established the “imperial presidency,” referring to the expansive use and subsequent abuse of executive authority.
Economic Shift: War mobilization effectively ended the Great Depression in the United States.
Military Recruitment: - Over people volunteered for service after Pearl Harbor. - To meet the needs of a two-front war, the Selective Service System expanded the draft, providing an additional soldiers.
Women’s Auxiliary Army Corps (WAAC): Established May 15, 1942, at the urging of General George Marshall. Women volunteers served in non-combat roles such as nurses, ambulance drivers, radio operators, electricians, and pilots in both the domestic and international theaters.
Minority Contributions: - Tuskegee Airmen: Pilots of the all-Black 99th Pursuit Squadron who fought in Italy. - 92nd Infantry Division (Buffalo Soldiers): An all-Black unit that earned numerous awards for courage during six months of fighting in Europe. - Asian Americans: More than Chinese Americans and Japanese Americans (including the 442nd Infantry Regimental Combat Team established in 1943) enlisted. Many served as spies or interpreters to prove their loyalty despite being treated with suspicion. - Navajo Code Talkers: Four hundred Navajo members were recruited into the Marine Corps to communicate orders in their native language, a code the Japanese could not decipher.
Domestic War Production and Science
War Production Board (WPB): Established by FDR in January 1942 via Executive Order 9024. It directed the conversion of peacetime industries to war needs, allocated materials, and prohibited nonessential production. It rationed gasoline, heating oil, metals, rubber, paper, and plastics until its dissolution in 1945.
Rationing: Families received monthly ration books for scarce consumer goods, including sugar, coffee, meats, fats, canned fish, cheese, and canned milk.
Propaganda and Finance: The War Advertising Council (established June 1942) promoted patriotism, the purchase of war bonds, and the planting of “victory gardens” to supplement the food supply.
Office of Scientific Research and Development (OSRD): Created in 1941 to integrate scientists into the war effort. Achievements included: - Radar and Sonar development. - Use of pesticides like DDT to fight insects in jungles. - “MLiracle drugs” such as penicillin.
Industrial Efficiency: Industrialist Henry J. Kaiser established seven shipyards (four in the Bay Area). Using prefabricated parts, the production time for a Liberty ship was reduced from days in 1941 to days by 1943.
Labor Dynamics and Social Change
The Bracero Program: To meet labor shortages, the U.S. government brought tens of thousands of Mexican contract workers into the country. They faced low pay and oppressive working conditions.
Women in Defense: Over women worked in defense industries. Despite systemic wage discrimination (earning approximately of men’s wages for the same work), they proved capable in roles such as welding and riveting. “‘Rosie the Riveter,” illustrated by Norman Rockwell, became the symbol of this workforce.
The Second Great Migration: Between 1940 and 1970, over Black Americans moved from the South to the Northeast, Midwest, and West for war production jobs. Defense plants hired over minority workers.
Civil Rights Activism: A. Philip Randolph, leader of the largest Black American labor union, organized a march on Washington for July 1, 1941, to protest discrimination. To prevent the protest, FDR issued Executive Order 8802, requiring equitable participation in defense industries regardless of race, creed, color, or national origin.
Social Conflict and Internment during Wartime
Social Impacts: Unemployment hit a low of in 1944. Weekly pay rose for wage workers. Farmers saw crop production increase by and income triple.
Race Riots: - Detroit (July 1943): Racial tensions led to a riot leaving 34 dead. - Los Angeles (June 1943): The “‘Zoot Suit Riots” occurred when Anglo servicemen attacked Mexican-American youth wearing zoot suits; police primarily arrested the Mexican youths.
Japanese American Internment: - Following Pearl Harbor, prejudice and false rumors of sabotage led FDR to sign Executive Order 9066 on February 19, 1942. - It mandated the removal of people of Japanese ancestry from the West Coast. - Japanese Americans (two-thirds were Nisei, or second-generation citizens) were sent to ten relocation centers in remote Western areas. - Families were forced to sell homes and businesses far below value. No evidence of spying was ever found. - Korematsu v. United States (1944): The Supreme Court ruled the evacuation was justified by “military necessity.” - Redress: In 1965, Congress authorized for lost property. The Civil Liberties Act of 1988 provided to each surviving internee, with checks issued in 1990.
Global Diplomacy and the Postwar Order
The Yalta Conference (February 1945): The “Big Three” (Roosevelt, Churchill, Stalin) met at Yalta. - Stalin pushed for a divided Germany to prevent future threats. - Agreement: Germany would be temporarily divided into four zones (U.S., British, Soviet, French). - Stalin promised “free and unfettered elections” in Poland and agreed to join the war against Japan and participate in the United Nations (UN) conference.
Leadership Transition: FDR died of a stroke on April 12, 1945; Harry S. Truman became the 33rd president.
The Potsdam Conference (June–July 1945): Truman, Churchill, and Stalin finalized the occupation quadrants of Germany and Berlin. Policies included demilitarization, de-Nazification, and the establishment of an Allied Control Commission.
The United Nations: Established October 24, 1945. It featured a General Assembly and a Security Council with five permanent members (U.S., Great Britain, Soviet Union, France, China) holding veto power.
The Nuremberg Trials and International Law
The Trials: Held in Nuremberg, Germany, to prosecute 24 surviving Nazi leaders. 12 were sentenced to death.
Crimes Against Humanity: The trials established this concept and used the word “genocide” for the first time to describe the Nazi actions against Jews.
Individual Responsibility: The trials established that individuals are responsible for their actions even in war, and “following orders” is not a valid defense.
Postwar Casualties: An estimated people died worldwide during the war.
The Manhattan Project and the Atomic Age
Origins: Following German success in splitting uranium atoms in 1939, Albert Einstein warned FDR of potential high-power weapons.
Development: The Manhattan Project was the code name for the OSRD research into the atomic bomb. Much of the work was hidden at a secret facility in Los Alamos, New Mexico.
Truman’s Decision: Truman did not learn of the bomb until becoming President. To avoid an invasion of Japan, he authorized its use.
Atomic Bombings: - Hiroshima (August 6, 1945): The B-29 bomber Enola Gay dropped “‘Little Boy.” - Nagasaki (August 9, 1945): A second bomb, “‘Fat Man,” was dropped.
Surrender: Emperor Hirohito ordered surrender; formal ceremonies occurred September 2, 1945, on the USS Missouri in Tokyo Bay.
Occupation of Japan: Led by General Douglas MacArthur. He oversaw trials of Japanese leaders (including the execution of Hideki Tojo) and introduced the “‘MacArthur Constitution,” which established free-market practices, women’s suffrage, and fundamental freedoms.
Questions & Discussion
Essential Question: Is the government justified in suspending civil liberties during wartime?
Context: This question arises in the specific context of Executive Order 9066 and the Korematsu v. United States Supreme Court decision regarding the internment of Japanese Americans, as well as the expansion of executive power via the War Powers Act.