Slavery was introduced in north america by the: spanish portuguese africans

Portuguese

Explanation:

Slavery was introduced to North America very early on by the Portuguese, who used slave labor when they tried to set up a trading post in South Carolina early in the sixteenth century. The slaves rebelled, however, and escaped. In 1619, a Dutch trader sold slaves to the Jamestown colony as indentured servants. From this beginning, slavery became part of the American culture for more than two hundred years.

although the legal justifications for the trials and their procedural innovations were controversial at the time, the nuremberg trials are now regarded as a milestone toward the establishment of a permanent international court, and an important precedent for dealing with later instances of genocide and other crimes