Original sentence: The origins of the American Civil War lay in the complex issues of slavery, competing understandings of federalism, party politics, expansionism, sectionalism, economics, and modernization in the Antebellum Period
Edited sentence: The origins of the American Civil War lay in the issues of a national tarriff, competing understandings of federalism, party politics, expansionism, sectionalism, economics, and modernization in the Antebellum Period