B! The main goal was to keep slavery out of all western lands
The answer is B: The Europeans were trying to convert them to Christianity
The answer is Sir Francis Drake. He is an English men but had nothing to do with Spain.
Slavery ended when President Abraham Lincoln delivered his iconic Emancipation Proclamation. This would eventually free black people so they could become ordinary citizens and NOT slaves. So basically, slavery was ended all thanks to good ol' Lincoln :)