Dred Scott was an African-American slave in the United States who unsuccessfully sued for his freedom

Freedom (political)

Political freedom is a central philosophy in Western history and political thought, and one of the most important features of democratic societies...

 and that of his wife and their two daughters in the Dred Scott v. Sandford

Dred Scott v. Sandford

Dred Scott v. Sandford, , also known as the Dred Scott Decision, was a ruling by the U.S. Supreme Court that people of African descent brought into the United States and held as slaves were not protected by the Constitution and could never be U.S...

case of 1857, popularly known as "the Dred Scott Decision." His case was based on the fact that although he and his wife Harriet Scott were slaves, he had lived with his master Dr. John Emerson in states and territories where slavery was illegal according to both state laws and the Northwest Ordinance of 1787, including Illinois

Illinois

Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

 and Minnesota

Minnesota

Minnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...

 (which was then part of the Wisconsin Territory

Wisconsin Territory

The Territory of Wisconsin was an organized incorporated territory of the United States that existed from July 3, 1836, until May 29, 1848, when an eastern portion of the territory was admitted to the Union as the State of Wisconsin...

).