Question

Although Columbus wasn't a hero, what was one benefit of his journeys?

He brought back slaves to Spain, which began the slave trade.
He began an exchange of goods between the New World and the Old World.
He found unlimited gold supplies in the Caribbean, which funded three more journeys.
He introduced disease to the New World, which began to build up the natives' immunity.

Answer 1

The second answer
Because the trade led to many riches with countries and was used for so long