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1491
Refers to the years before Columbus' arrival, characterized by advanced civilizations among indigenous peoples like Cahokia and Pueblo.
1492
Marks Columbus's arrival in North America.
1607
Signifies the establishment of Jamestown, the first permanent English settlement.
1619
Marks the establishment of the House of Burgesses, the first representative assembly, and the arrival of the first slave ship in the British colonies.
1620
Signifies the arrival of the Pilgrims on the Mayflower and the formation of Plymouth Colony in Massachusetts.
1630
Marks the arrival of the Puritans in the Massachusetts Bay Colony, led by John Winthrop.
1680
Signifies the Pueblo Revolt (Pope's Rebellion), where Pueblo Indians temporarily ousted the Spanish from present-day New Mexico.
1754-1763
Refers to the Seven Years War/French Indian War/Great War for Empire.
1776
Signifies the colonies declaring independence from Britain.
1775-1783
Marks the American Revolution.
1777-1789
Refers to the Articles of Confederation.
1787
Signifies the Constitutional Convention.
1789
Marks George Washington's inauguration as the first president of the US.
1800
Signifies Jefferson's election, marking the first peaceful transfer of power between political parties.
1803
Refers to the Louisiana Purchase.
1807
Marks the end of the importation of slavery as set by the Constitution and the intensification of the internal slave trade.
1820
Signifies the Missouri Compromise.
1828
Marks Andrew Jackson's election and the expansion of voting rights to all white men.
1833
Refers to the foundation of the Whig Party in the US.
1844
Signifies Polk's election.
1845
Marks the use of the term Manifest Destiny to describe expansion to the West.
1846-1848
Refers to the War with Mexico, resulting in the Mexican Cession.
1848
Signifies the Seneca Falls Convention and the Declaration of Sentiments.
1850
Marks the Compromise of 1850.
1857
Refers to the Dred Scott vs. Sanford decision.
1860
Signifies Lincoln's election as president and the secession of deep southern states.
1861-1865
Refers to the Civil War.
1869
Signifies the completion of the Transcontinental Railroad at Promontory Point.
1877
Marks the Compromise of 1877, settling the election of 1876 and ending Reconstruction.
1860s-1900
Refers to industrialization and a significant increase in immigration, particularly from eastern and southern Europe.
1890
Signifies the Battle of Wounded Knee, marking the end of armed Indian resistance.
1892
Refers to the formation of the Populist Party.
1896
Signifies the Plessy vs. Ferguson decision.
1898
Marks the Spanish-American War/War of 1898.
c.1900
Refers to the rise of the Progressive reform movement to counter the ills of industrialization, with Teddy Roosevelt becoming president.
1912
Signifies Woodrow Wilson's election as president.
1914-1918
Refers to World War I, with the US entering in 1917 and the beginning of the Great Migration.
1920
Signifies the passing of women's suffrage (19th amendment).
1929
Refers to the Stock Market crash and the beginning of the Great Depression.
1932
Signifies FDR's election and the beginning of New Deal legislation.
1939-1945
Refers to World War II, with the US entering after the attack on Pearl Harbor in 1941.
1945
Signifies the end of World War II, with the US and USSR becoming contrasting world powers and the beginning of the Cold War.
1950-1953
Refers to the Korean War.
1954
Signifies the Brown vs. Board of Education decision.
1955
Marks the Montgomery Bus Boycott.
1962
Refers to the Cuban Missile Crisis.
1963
Signifies MLK's March on Washington and Kennedy's assassination.
1964
Civil Rights Act passed
1965
Voting Rights Act passed
1964-1973
US involvement in Vietnam War
1980
Ronald Reagan elected, conservative ascendance
1989
Cold War ends with fall of the Berlin Wall, USSR dissolves in 1991
1991
First Gulf War
2001
Al Qaeda attacks US on September 11, War on Terror
2003
Troops to Iraq, demonstrates GW Bush's doctrine of "pre-emptive war"
2008
Obama elected president, first African American to hold office