Based on the apparent jigsaw-puzzle fit of some of the earth's largest landforms, especially africa and south america, scientists have proposed that about 200 million years ago the continents were once joined together in a supercontinent called

Pangaea the super continent that may have housed all the ancient animals that soon started to spread apart to form today's continents, some say that the continents are still moving and soon will become a super continent again by crashing into each other.

Answer after wwii, communist countries in eastern europe formed the warsaw pack, a military alliance, and comecon, an economic alliance;