Slave and Free States - Conflict Over New Territories

Conflict Over New Territories

During the War of 1812, the British accepted as free all slaves who came into their hands, with no conditions as to military service such as had been made in Dunmore's Proclamation in the Revolutionary War. By the end of the War of 1812, the momentum for antislavery reform, state by state, appeared to run out of steam, with half of the states having already abolished slavery (Northeast), prohibited from the start (Midwest) or committed to eliminating slavery, and half committed to continuing the institution indefinitely (South).

The potential for political conflict over slavery at a federal level made politicians concerned about the balance of power in the U.S. Senate, where each State was represented by two Senators. With an equal number of slave states and free states, the United States Senate was equally divided. As the population of the free states began to outstrip the population of the slave states, leading to control of the House of Representatives by free states, the Senate became the preoccupation of slave state politicians interested in maintaining a Congressional veto over federal policy in regard to slavery. As a result of this preoccupation, slave states and free states were often admitted into the Union in pairs to maintain the existing Senate balance between slave and free.