Many of the people came to escape religious persecution
Considering that slavery originated sometime in the 1620s in North America, and that it lasted until 1865, the correct answer to how much it lasted should be around 245 years.
Karl marx and his fellow writer Engel believed that revolution should start from below, by proletariat coming together, while Maoism recruited the urban population,red army and students. Marxism did not beleive in violent take over but maoism did, which led to him killing millions of people.