What was one important thing that Abraham Lincoln did?
He was the first President of the United States
He led the United States during World War I
He freed the slaves with the Emancipation Proclamation✓Correct answer
He wrote the Declaration of Independence
Official answer
freed the slaves (Emancipation Proclamation)
saved (or preserved) the Union
led the United States during the Civil War
Explanation
Lincoln issued the Emancipation Proclamation, held the Union together and led the country through the Civil War. The other achievements belong to Jefferson, Washington and Wilson.