What was the main resource Europeans exporting from African, especially the Portuguese, starting in the 1500s?

ok well i know that there are a few different ones,  gold, precious stones, wood, ivory, silver, ebony.

Explanation:

hope this helps have a good day

well first we can compare on what the slave masters ate and what the slaves ate well the masters ate fancy great food like chicken rice mash potatose and stuff like that and slaves ate well food that your not suppost to eat like the weird parts of turkey and chicken and slaves master chilled beat and eat and slaves work get beat and get little of sleep there you go

calvin taught his followers that human beings needed to follow strict rules to overcome their nature and do good. second choice