They say that America is the great melting pot, thats horse hockey. when was the last time a melting pot went into space or accomplished something great. It was all well and good when we were taking the best and brightest minds from other countries but who wants the worst and least law biding that are flooding into our country now.
I think you're missing the point of the term "melting pot". America used to be famed for, almost alone among other nations, accepting diverse groups (grudgingly at times) who, in a generation or so, adapted themselves to our culture and mores. The "Diversity Movement" has actively subverted this trend by encouraging immigrants to keep to their own cultural heritage and language instead of adopting American ways. We are being "balkanized" by "diversity" and "political correctness", thus throwing away the advantages we had before.