Already here.
Lots of Indian slavery on the Northwest Coast. The captured and traded slaves in an organized system all the way from Canada down to Modoc County, California.
I have a vague memory of something about one tribe or another having a very large and concentrated population on Lake Michigan for many years, perhaps centuries... supposedly depended on the trees growing there... "what trees?" you might ask... exactly: supposedly they cut 'em all down, ruined their economic base by @1300AD, and had to hit the road... headed west, eventually gave rise to the Lakota tribes.
you ever hear anything like that?
Lincoln's proclamation did NOT end slavery in the Southwest.
It wasn't until around 1888 that it finally ended.