Question

Why are the continents where they are today?

Answer 1

Because of Pangaea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras.[2][3] It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago.In contrast to the present Earth and its distribution of continental mass, much of Pangaea was in the southern hemisphere and surrounded by a superocean, Panthalassa. Pangaea was the most recent supercontinent to have existed and the first to be reconstructed by geologists.

Answer 2

 they split along natural occurring fault lines and moved away from each other to what we have today. They will continue to drift until they collide..

Hope it helps :)