Was it a union or a confederate state?

South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Arkansas, North Carolina, Tennessee, and Virginia were all Confederate Sates.

Maine, Vermont, New Hampshire, Massachusetts, New York, Connecticut, Pennsylvania, New Jersey, Ohio, Michigan, Indiana, Illinois, Iowa, Wisconsin, Minnesota, Rhode Island, Kansas, Oregon, and California were Union States.

Delaware, West Virginia, Kentucky, Missouri, and Maryland were Border States.

The rest weren't states yet or didn't pick a side.

The above comment is correct.