Canadians now generally use the term "First Nations" to refer to
Native Americans. In Alaska, because of legal use in the Alaska
Native Claims Settlement Act (ANSCA) and because of the presence
of the Inuit, Yupik, and Aleut peoples, the term Alaskan Native
predominates. (See further discussion below.) Native Americans
officially make up the majority of the population in Bolivia and
Guatemala and are significant in most other Hispanic American
countries, with the possible exception of Costa Rica, Cuba,
Dominican Republic and Uruguay. Based on anthropological
evidence, at least three distinct migrations from Siberia across
the Bering Land Bridge occurred. The first wave of migration
came into a land populated by the large mammals of the late
Pleistocene epoch, including mammoths, horses, giant sloths, and
wooly rhinoceroses. The Clovis culture[?] provides one example
of such immigrants. Later the Folsom culture[?] developed, based
on the hunting of bison. The second immigration wave comprised
the Athabascan pe