What was the first hemisphere “discovered” by the Europeans? What were the impacts of this discovery?

Answer 1

Well, I suppose the Southern one, Africa and on to the Indian Ocean and the coast of Brazil. The impact of the discovery of a route to the Indian Ocean is huge, the spice trade etc.

Answer 2

It was seeking a shorter route to the East Indies that led Columbus and others west to the Americas, although European seamen had wandered here previously.