Abraham Lincoln: The 16th President of the United States who led his country through its Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis. He preserved Union, abolished slavery, strengthened federal government.
Kansas-Nebraska Act: An act passed by Congress which allowed people in Kansas and Nebraska to decide for themselves whether or not to allow slavery within their borders.
Dred Scott Decision: A landmark decision by U.S Supreme Court that held African Americans were not citizens under U.S Constitution and could not sue in federal courts.