The first people to arrive in America were Native Americans. They arrived about 13,000 years ago. However the first colonists arrived around 1607.
Many nations had already abolished slavery.
Let me know if you want to know why.
D. Petrarch
Petrarch was an Italian poet and scholar who paved the way for the Renaissance by re-discovering Cicero's letters. He has also been called "The Father of Humanism."