Barack Obama said this quote
“ Moreover, I believe that part of America's genius has always been its ability to absorb newcomers, to forge a national identity out of the disparate lot that arrived on our shores. In this we've been aided by a Constitution that--despite being marred by the original sin of slavery--has at its very core the ideas of equal citizenship under the laws; and an economic system that, more than any other, has offered opportunity to all comers, regardless of status or title or rank. ”