Growth of a "slave power" in the united states referred to

in 476 c.e. romulus, the last of the roman emperors in the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the roman empire had brought to western europe for 1000 years was no more.

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery