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Louisiana Purchase.
The Louisiana Purchase (1803) was a land deal between the United States and France, in which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi River for $15 million. -
The Assassination of President Lincoln
On April 14, 1865, John Wilkes Booth, a famous actor and Confederate sympathizer, fatally shot President Abraham Lincoln at a play at Ford's Theater in Washington, D.C. -
Vietnam War.
The Vietnam War was a long, costly armed conflict that pitted the communist regime of North Vietnam and its southern allies, known as the Viet Cong, against South Vietnam and its principal ally, the United States. -
Manhattan Project.
The Manhattan Project was a research and development project that produced the first nuclear weapons during World War II. It was led by the United States with the support of the United Kingdom and Canada.