Reconstruction under Abraham Lincoln
The original Northern objective in the Civil War was the preservation of the Union—a war aim with which virtually everybody in the free states agreed. As the fighting progressed, the Lincoln government concluded that emancipation of the slaves was necessary in order to secure military victory; and thereafter freedom became a second war aim for the members of the Republican Party. The more radical members of that party—men like Charles Sumner and Thaddeus Stevens—believed that emancipation would prove a sham unless the government guaranteed the civil and political rights of the freedmen; thus, equality of all citizens before the law became a third war aim for this powerful faction. The fierce controversies of the Reconstruction era raged over which of these objectives should be insisted upon and how these goals should be secured.
United States: After 1861The United States after 1861.Encyclopædia Britannica, Inc.