Kept a lot out of history. For me the big one was not FDR's New Raw Deal getting the country out of the depression. It was the reaction to Hitler steamrolling Europe and Pearl Harbor that did it.
DIRECT FROM LIBERAL WIKIPEDIA:; THE CHEROKEE, MUSCOGEE, SEMINOLE, CHICKASAW, AND CHOCTAW NATIONS ADOPTED SLAVERY. DURING THE TRAIL OF TEARS, THEY TOOK WITH THEM SEVERAL THOUSAND AFRICAN SLAVES. THE FACT THAT THE CHEROKEE NATION HELD AFRICAN SLAVES PLAYED A ROLE IN THEIR DECISION TO SIDE WITH THE CONFEDERACY IN THE AMERICAN CIVIL WAR.'