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The United States Library of Congress is founded.
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U.S. President John Adams is the first President to live in the White House
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Ohio is admitted to the Union as the 17th U.S. state.
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President Thomas Jefferson doubles the size of the United States of America with his purchase of the Louisiana Territory
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New Jersey becomes the last northern state to abolish slavery.
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The duel between Alexander Hamilton and Vice President Aaron Burr, longtime political rivals, occurs in Weehawken, New Jersey, culminating in the death of Hamilton.
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The first steam-powered ferry service between New York City and Hoboken, New Jersey is started on John Steven's ship, the Juliana.
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U.S. President James Madison asks Congress to declare war on the United Kingdom. Before the vote could be approved, on June 16, British ships raise a blockade against the United States.
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James Monroe is inaugurated as the President of the United States, succeeding James Madison
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The United States of America admits its 20th state, Mississippi.
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Andrew Jackson and his American army invade Florida in the Seminole War, causing repercussions with Spain as negotiations to purchase the territory had just begun.
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The internal combustion engine named the "Gas Or Vapor Engine" is patented by American Samuel Morey.
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In New York State, slavery is legally abolished.
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The Specie Act is issued by executive order of President Andrew Jackson. This act would lead to the failure of the economy of land speculation and the Panic of 1837.
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The first university west of the Mississippi River is established, the University of Missouri.
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In Jackson, Mississippi, the first state law allowing women to own property is passed.
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The first major wagon train headed for the northwest via the Oregon Trail begins with one thousand pioneers from Elm Grove, Missouri.
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Oregon is admitted to the Union as the 33rd state.
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Union forces, including black Union soldiers, capture the Confederate Fort Harrison, south of Richmond.
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General Robert E. Lee, as commander in chief of Confederate forces, surrenders his 27,000 man army to Ulysses S. Grant
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Abraham Lincoln is assassinated in Ford's Theatre, Washington, D.C.
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The Thirteenth Amendment, abolishing slavery, takes effect.
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The first African-American to be sworn into office in the United States Congress, Hiram Rhodes Revels, a Republican from Mississippi takes his place in the United States Senate.
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The first United States zoo opens in Fairmount Park, Philadelphia.