Label the states that existed in mid-1850. how many of them allowed slavery? how many did not?

Slave states: Delaware, Maryland, Virginia, North Carolina, South Carolina, Kentucky, Tennessee, Georgia, Florida, Alabama, Mississippi, Louisiana, Arkansas, Missouri, Texas

Free States: Maine, New Hampshire, Vermont, Connecticut, Rhode Island, New Jersey, New York, Massachusetts, Pennsylvania, Ohio, Indiana, Michigan, Illinois, Wisconsin, Minnesota, Iowa, California, Oregon

Almost all of these states were decided based on the Missouri Compromise creating a clear line of North v. South.