They didn't look for a new world. They stumbled upon it.
They were looking for new trade routes to the known world.
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The Europeans explored the New World with ships.
Because other Africans sold them to the Europeans as slaves and the new world colonies needed workers.
gold
It was the other way around. The Europeans got foods/plants from the New World. Potatoes, chocolate, tomatoes, corn are some of the new foods.
The vikings are believed to have discovered the new world first but Christopher Columbus "discovered the new world" in 1629