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Thomas Jefferson becomes the third president
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signed the Louisiana Purchase Treaty
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Lewis and Clark explore the West and find a route to the Pacific Ocean.
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Mexican War took place in America's effort to gain California and other territory in Southwest.
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Abraham Lincoln is elected president
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The Union faced secessionists in eleven Southern states grouped together as the Confederate States of America
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Lincoln is assassinated by John Wilkes Booth in Washington, DC
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The war ended in Spring, 1865. Robert E. Lee surrendered the last major Confederate army to Ulysses S. Grant at Appomattox Courthouse on April 9, 1865.
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the United States reached an agreement to purchase Alaska from Russia for a price of $7.2 million.
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U.S. enters World War I, declaring war on Germany
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The Treaty of Versailles is signed by Germany and World War I comes to an end
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The Star-Spangled Banner is adopted as the national anthem.
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U.S. declares war on Japan
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The Normandy landing operations of the Allied invasion of Normandy in Operation Overlord during World War II.
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World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945
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United Nations is established
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Hawaii became the 50th state in August, 1959.
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On March 8, 1965, the first American combat troops – the 9th Marine Expeditionary Brigade – waded ashore at China Beach north of Da Nang.
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In 1969, when the number of U.S. military personnel in South Vietnam had reached 540,000, Nixon announced a modest troop withdrawal.
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Two planes were flown into the towers of the World Trade Center in New York City, a third plane hit the Pentagon just outside Washington, D.C., and the fourth plane crashed in a field in Pennsylvania.