How did slavery started in the US?

In the earlier years like the 1700s the British started coming to America and bringing the African Americans with them so it just kind of stuck.

When Spanish and Portuguese went to the Americas to start colonies, they began to grow crops that needed labor and so they enslave Native Americans but the Native Americans were not immune to some of the disease the Europeans brought over so they began to enslave Africans because they were immune to most of the European disease.