18,000 Ancestors of Native Americans arrive from Asia.
1000 Vikings land in North America.
1492 Christopher Columbus lands in the New World.
1587 Roanoke Colony in Virginia. All 120 colonists mysteriously disappeared, and were never seen again.
1607 Jamestown Settlement. 104 English men settled on the banks of Virginia's James River.
1620 Pilgrims founded Plymouth Colony. Mayflower departed Plymouth, England with 102 passengers.
1630 Winthrop's Fleet landed in Salem, Massachusetts. 1,000 people in this group of settlers.
1631 In the next ten years, 20,000 persons immigrated to Massachusetts.
1640 There was hardly any further migration into New England until after the Revolution.
1675 King Philip's War fought in New England.
1754-1763 The French and Indian War leaves Britain in control of most of eastern North America.
1770 The Boston Massacre.
1773 The Boston Tea Party.
1774 The First Continental Congress meets in Philadelphia.
1775 The American Revolution begins with the battles of Lexington and Concord.
1776 The Declaration of Independence.
1781 American troops defeat British troops at Yorktown, Virginia.
1783 Britain recognizes U.S. independence.
1788 The Constitution comes into effect.
1789 George Washington is elected first President.
1791 The Bill of Rights becomes part of the Constitution.
1803 The Louisiana Purchase.
1812-1815 The War of 1812.
1819 Spain cedes Florida to the U.S.
1823 The Monroe Doctrine warns against European interference in the Americas.
1825 The Erie Canal is completed.
1836 Texas declares independence from Mexico.
1837 Michigan entered the union on January 26
1846-1848 The Mexican War. The U.S. gains part of Arizona, New Mexico, Colorado, Nevada, Wyoming, Utah and California.
1861-1865 The Civil War.
1863 Abraham Lincoln issues the Emancipation Proclamation.
1865 President Lincoln is assassinated. The 13th Amendment outlaws slavery.
1867 The U.S. buys Alaska from Russia.
1869 The transcontinental railroad is completed.
1898 The U.S. defeats Spain in the Spanish-American War.
1914 The Panama Canal is opened.
1917 The U.S. enters World War I.
1918 World War I ends; President Woodrow Wilson's Fourteen Points form the basis of peace negotiations.
1920 The 19th Amendment gives women the right to vote.
1929 A stock market crash begins the Great Depression.
1933 President Franklin D. Roosevelt introduces his New Deal program.
1941 After the Japanese attack Pearl Harbor, the U.S. enters World War II.
1945 The U.S. drops two atomic bombs on Japanese cities; World War II ends.
1948 Congress approves the Marshall Plan.
1950-1953 The Korean War.
1954 The Supreme Court rules racial segregation in public schools is illegal.
1962 The U.S.S.R. removes its missiles from Cuba ending the Cuban Missile Crisis.
1963 President John F. Kennedy is assassinated. Martin Luther King Jr. leads a civil rights march on Washington, D.C.
1965 President Lyndon B. Johnson orders U.S. troop buildup in Vietnam.
1969 Neil Armstrong and Buzz Aldrin are the first men on the moon.
1973 The last American soldiers leave Vietnam.
1974 Richard M. Nixon is the first President to resign from office.
1987 The U.S. and the U.S.S.R. sign the first comprehensive nuclear arms control treaty.
1989 U.S. troops invade Panama and depose military leader Manuel Antonio Noriega.
1991 The Persian Gulf War.
1992 The U.S. sends troops to Somalia to help distribute food to the famine-ridden nation.