Most beleivable of the three major migration theories.

   The three theories are: 1. Land Bridge Theory 2. Ice Bridge Theory 3. Continental Shelf Theory. The Land Bridge Theory is that the ocean dropped 300 feet and there was no Bering Straight just land so the Native Americans could walk across. The Ice Bridge Theory is that the Bering Straight froze and created a frozen bridge for the Native Americans could walk across. The Continental Shelf Theory is that the Asian continental shelf and the North American continental shift were connected and created a bridge to walk across. The most believable in my opinion is the Continental Shelf theory. I belive this to be true because the continents used to be all one massive continent. This would make it so there is no water so it would be easy to cross.