They are contributing nothing at all that we really need, except cheap labor for multinational corporations which keeps White wages low. History demonstrates quite clearly that multi-racial empires do not prosper, and in the long run do not survive. Ame rica will not survive the curse of multi-racialism any more than those other societies did. There is no magical law of the universe exempting North America from the basic principles of human biopolitics. Diversity is indeed the antithesis of nationhood.
Nations arise in large part from their very racial, religious, and cultural unity and uniqueness.
All multi-cultural nations must by definition be in a state of political, moral, economic and social decay. Greed and corruption invariably characterize the government of the mutli-racial state, coupled with oppressive measures directed against its citizens. Lies and deceit are the stock in trade of multi-cultural media, politicians and educational institutions. Democracy, a flawed system to begin with, is perverted into an instrument of disastrous cultural and biological leveling. From democracy steps forth the cruelest of tyrants.