The Helios Biblios Hour : The Who's who in Black HIStory just the Facts.

No. All slaves in the United States did not come from Africa. Before slaves were brought from Africa, some early settlers in North America tried to make slaves of the local people who were living here. These Native Americans, because they knew the land so well and because they usually had families nearby, were often able to escape to their own people. Some simply refused to work. Others died in captivity or were killed when they tried to escape. In South America, the Spanish and Portuguese enslaved many native people..For decades, scholars peered at the painful and complex topic of American slavery through a purely “black-white” lens—in other words, black slaves who had white masters.  The sad reality that some Native Americans, (in particular, the Creek, Cherokee, Choctaw, Chickasaw, and Seminole, or “the Five Tribes”) also participated in chattel and race-based slavery, was rarely acknowledged in the historical annals.Not all Africans were slaves. Throughout the colonial period and all the years after that, some Africans and African Americans (people of African descent who were born in America) were free. Some Africans came here as indentured servants, with contracts like those of the European indentured servants, 

The Cannabis Plant in Africa

When the natives first began using cannabis as a drug is not known. The plant is not indigenous to Africa. The only way the African natives could have learned about it would have been through their contact with outsiders, and the most likely point of contact was the Arabs.The earliest evidence for cannabis in Africa outside of Egypt comes from fourteenth-century Ethiopia, where two ceramic smoking-pipe bowls containing traces of cannabis were recently discovered during an archaeological excavation.