Link, please.
“Link, please.”
You’re asking for a link for the claim that the USA was built by immigrants? Er, ok.
http://en.wikipedia.org/wiki/European_colonization_of_the_Americas
“Many immigrants to the American colonies came for economic reasons. Inspired by the Spanish riches from colonies founded upon the conquest of the Aztecs, Incas, and other large Native American populations in the sixteenth century, the first Englishmen to settle in America hoped for some of the same rich discoveries when they first established a settlement in Jamestown, Virginia.”