U.S. expansion led to a civil war that transformed American society, ended slavery, and raised questions about American democracy. Test your knowledge of this pivotal time in U.S. History with this Barron's quiz developed from our must-have AP® U.S. History Premium study guide. #apush #apushistory #apexam #apushistoryexam #highschool #grade10 #grade11 #grade12 AP® is a registered trademark of the College Board, which was not involved in the production of, and does endorse, this product.