In the 1800s, the United States grew and changed. It grew larger, reaching from the Atlantic Ocean to the Pacific Ocean. Slavery was one of the biggest problems.
Because of disagreements over slavery, the nation divided in two. The North and South fought the Civil War. The North won. Slavery ended.
Section "Learn and Explore" uses official instructions and media files of US Citizenship and Immigration Services, US National Museum of American History, The Smithsonian Institution and other governmental and public organization.