Race, culture and assimilation

[GMDino]

There have been multiple threads and posts about how foreigners need to stay in their own country because their culture is too different from ours or that they refuse to assimilate properly.

While I am of the mind that proper assimilation also includes some absorbing of the new culture by the new country I posed a question in a thread that I would like to see the feeling on of the folks in here.

Would you like to see just an all white / Christian culture in America?  Seriously.  An American where foreigners are kept out because of their culture and / or race.

Serious answers please.