Original sentence: Many Northerners, especially leaders of the new Republican Party, considered slavery a great national evil and believed that a small number of Southern owners of large plantations controlled the national government with the goal of spreading that evil.Southerners worried instead about the relative political decline of their region because the North was growing much faster in terms of population and industrial output.The origins of the American Civil War lay in the complex issues of party politics, competing understandings of federalism, slavery, expansionism, sectionalism, economics, and modernization in the Antebellum Period
Edited sentence: Although Legal under the constutition till after the end of the war, some Northerners, especially leaders of the new Republican Party, considered slavery a great national evil and believed that a small number of Southern owners of large plantations controlled the national government with the goal of spreading that evil.Southerners worried instead about high tariffs and the relative political decline of their region because the North was growing much faster in terms of population and industrial output.The origins of the American Civil War lay in the complex issues of party politics, high tariffs, competing understandings of federalism, slavery, expansionism, sectionalism, economics, and modernization in the Antebellum Period