What is the Bering Land Bridge, how Did It Come about and why Is It Important to the Peopling of the Americas?

In my short essay I will be giving a brief description on what is the Bering Land Bridge, how did it come about and why is it important to the peopling of the Americas?
The Bering Land Bridge or also known as Beringia was a piece of land that connected Alaska and Siberia during several times during the Pleistocene. The distance between Asia and North America is only about 85km. The land bridge became as much as 1,500 km wide from north to south during various times of the Pleistocene. What created this to happen were periods of glaciation during the last 1.8 million years. …