Abraham Lincoln was the 16th president of the United States, serving from 1861 until his assassination in 1865. He led the country during the American Civil War and worked to abolish slavery. Lincoln grew up in a poor family in Kentucky and Indiana, and had limited formal schooling. As a politician, he opposed the expansion of slavery and was elected president in 1860 on the Republican ticket. During his presidency, Lincoln successfully led the country during the Civil War and issued the Emancipation Proclamation to free slaves. However, he was assassinated by John Wilkes Booth in April 1865.