During the Age of exploration, primarily *European* explorers traveled across the Atlantic and pacific oceans and first encountered civilizations in the Americas, since they were in competition so see who could extract the most natural resources.
Dred Scot was taken to live in St.Louis by his slaveholder. this is because during his trial, he stated that since his slaveholder had taken him to live in a free state, that meant that he was now a free man. hope this helps!
