Abraham Lincoln, the 16th President of the United States, is historically recognized for his pivotal role in the abolition of slavery. During the American Civil War, he issued the Emancipation Proclamation in 1863, which declared millions of enslaved people in Confederate states to be free. He then championed the 13th Amendment to the Constitution, which formally abolished slavery throughout the entire United States in 1865, marking a monumental shift in American society.
Thomas Jefferson, while authoring the Declaration of Independence, was a slave owner and did not abolish slavery during his presidency.
George Washington, the first President, was also a slave owner and did not abolish slavery during his term.
Stanley Jackson is not a recognized President of the United States.