There's no hope for the United States to do what you're asking. The diversity ship sailed in the early 1900's. Americans need to try and unite on common ground. There are people of all races who believe in liberty and individualism. If they balkanize themselves by race they will be divided and lose to Globohomo. White people should try to be leaders and teach their cultural values to others as much as possible. Maybe you think Asians are "bugmen" but some of them will listen to reason and work with you.

If you're talking about European countries, they may still have a fighting chance to remain ethnostates. The UK is probably a lost cause.