Abraham Lincoln (February 12, 1809 – April 15, 1865) was the sixteenth President of the United States, serving from March 4, 1861 until his assassination. As an outspoken opponent of the expansion of slavery in the United States, Lincoln won the Republican Party nomination in 1860 and was elected president later that year. During his term, he helped preserve the United States by leading the defeat of the secessionist Confederate States of America in the American Civil War. He introduced measures that resulted in the abolition of slavery, issuing his Emancipation Proclamation in 1863 and promoting the passage of the Thirteenth Amendment to the Constitution in 1865.

Lincoln closely supervised the victorious war effort, especially the selection of top generals, including Ulysses S. Grant. Historians have concluded that he handled the factions of the Republican Party well, bringing leaders of each faction into his cabinet and forcing them to cooperate. Lincoln successfully defused a war scare with the United Kingdom in 1861. Under his leadership, the Union took control of the border slave states at the start of the war. Additionally, he managed his own reelection in the 1864 presidential election.

Opponents of the war (also known as "Copperheads") criticized him for refusing to compromise on the slavery issue. Conversely, the Radical Republicans, an abolitionist faction of the Republican Party, criticized him for moving too slowly in abolishing slavery. Even with these problems, Lincoln successfully rallied public opinion through his rhetoric and speeches; his Gettysburg Address is but one example of this. At the close of the war, Lincoln held a moderate view of Reconstruction, seeking to speedily reunite the nation through a policy of generous reconciliation. His assassination in 1865 was the first presidential assassination in U.S. history and made him a martyr for the ideal of national unity.

Scholars now rank Lincoln among the top three U.S. Presidents, with the majority of those surveyed placing him first. He is noted for his lasting influence on U.S. politics, including a redefinition of republicanism.

Abraham Lincoln's birthday, February 12, was formerly a national holiday, now commemorated as Presidents' Day. However, it is still observed in Illinois and many other states as a separate legal holiday, Lincoln's Birthday. A dozen states have legal holidays celebrating the third Monday in February as 'Presidents' Day' as a combination Washington-Lincoln Day.

To commemorate his upcoming 200th birthday in February 2009, Congress established the Abraham Lincoln Bicentennial Commission (ALBC) in 2000. Dedicated to renewing American appreciation of Lincoln’s legacy, the 15-member commission is made up of lawmakers and scholars and also features an adivsory board of over 130 various Lincoln historians and enthusiasts. Located at Library of Congress in Washington, D.C., the ALBC is the organizing force behind numerous tributes, programs and cultural events highlighting a two-year celebration scheduled to begin in February 2008 at Lincoln’s birthplace: Hodgenville, Kentucky.

Lincoln's birthplace and family home are national historic memorials: the Abraham Lincoln Birthplace National Historic Site in Hodgenville, and the Lincoln Home National Historic Site in Springfield, Illinois. The Abraham Lincoln Presidential Library and Museum opened in Springfield in 2005; it is a major tourist attraction, with state-of-the-art exhibits. The Abraham Lincoln National Cemetery is located in Elwood, Illinois.

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