File:US slavery legal in some form 1860.png

Summary
Blue states had outlawed slavery by 1860. Red states had legalized slavery in some form.

New Jersey (purple) abolished slavery in name in 1846 and had a weak gradual emancipation plan in place since 1804, but there were still 18 "apprentices for life" by the start of the Civil War.

New Hampshire never abolished slavery but its legislature did ratify the Thirteenth Amendment. In 1857, it passed an act that said "No person, because of decent, should be disqualified from becoming a citizen of the state." However, the act does not refer to one's status.

Prior to the Dred Scott Decision, slavery had been illegal in the unorganized territory next to Minnesota.