when was abraham lincoln president

Abraham Lincoln was the 16th president of the United States. He served as president from March 4, 1861, until his assassination on April 15, 1865. He was elected president in 1860 and then re-elected in 1864 for a second term. His presidency was marked by the American Civil War, and he played a key role in preserving the Union and leading efforts to abolish slavery during his time in office.