1.In North America, there was less racial mixing and less willingness to recognize the offspring of such unions and accord them a place in society.
2.Slavery in North America was different, being perhaps less harsh there than in the sugar colonies.
3.By 1750, slaves in the United States had become self-reproducing, and a century later almost all North American slaves had been born in the New World. That was never the case in Brazil and the Caribbean.
4.Many more slaves were voluntarily set free by their owners in Brazil than was ever the case in North America,
5.In North America, any African ancestry, no matter how small or distant, made a person "black"; not in Brazil, Moreover, color was only one criterion of class status in Brazil, and the perception of color changed with the educational or economic standing of individuals.