During the ice age, people from northern Asia are believed to have crossed either of these bridges as they were fleeing the icy conditions or chasing migratory herds of deer, buffalo, seal and caribou.
Factors which influenced the location of these settlements include access to fresh water, abundance of food/game, a need for defense and fertility of soil.
Theories have been formulated to explain the settlement of the Caribbean, including: following food source, migration of a group of Asiatic people (Mongolians) who followed animals (mammoth, deer and caribou- large reindeer) that migrated from Siberia to Alaska in search of food, and the migratory pattern of the indigenous people.
Over 25,000 years ago, the first set of people arrived from Asia to North America, crossing by means of the land and ice bridge which connected Siberia and Alaska (The Bering Strait).
The Amerindians migrated to the Caribbean from South America around 1000 B.C., driven by factors such as nomadism, population outgrowing available food supply, changes in climatic conditions, warlike nature, need for a larger settlement area with available resources, and access to fresh water.