Samuel G. Goodrich 
History of the Indians of North and South America [EPUB ebook] 

Excerpt: "When America was first discovered, it was found to be inhabited by a race of men different from any already known. They were called Indians, from the West Indies, where they were first seen, and which Columbus, according to the common opinion of that age, supposed to be a part of the East Indies. On exploring the coasts and the interior of the vast continent, the same singular people, in different varieties, were everywhere discovered. Their general conformation and features, character, habits, and customs were too evidently alike not to render it proper to class them under the same common name; and yet there were sufficient diversities, in these respects, to allow of grouping them in minor divisions, as families or tribes. These frequently took their names from the parts of the country where they lived."