How did people come to America from the Middle East?

After the flood and during the Ice Age, land bridges appeared that connected the Middle East with all parts of the world.  The waters in the ocean may have been fully frozen, allowing people to cross over during the ice age Between Alaska and Russia is the Bering Strait, and most likely all people who live on the North and South American continents crossed over in that area.  Another plausible theory is that people built boats and sailed to America (remember that Noah built a huge ark, so that knowledge could have been passed on to his relatives). 

Connection between Europe and North America
Connection between Asia and Austrailia
Connection between North American and South America