Was America uninhabited by humans before Indians came?

Answer 1

If by "Indians" you mean Salish, Hopi, Mohave, Cheyenne, Inuit, Comanche, Yanomamo, and Aztec -- in other words, people who were formerly classified as "proto-Mongoloids" and have been called "American Indians," "Amerinds," and "Native Americans" -- and those who are genetically similar to these groups, then the answer now seems to be yes.

Discoveries of skeletal remains in both North and South America in recent years point to human migrations to the New World that predate the appearance of "Indians." These remains have been studied and the opinion of researchers is that they represent different racial types. One is most similar to modern "Australoids," the group that was considered to include Australian Aborigines.

The very fact that I must speak in ambiguities regarding this topic shows you that the question is not completed answered, nor does the question mean the same thing to every scientist. What we can be certain of, though, is that various populations of humans with different features and genetic heritage existed in the Americas prior to the entry of the "Indians." It is possible that the "Indians" destroyed these people and/or mixed with them.