The following countries are or were one to 49.9 percent White within the past 60 years according to The World Factbook: Cuba, Peru, Brazil, Belize, Mexico, Georgia, Bolivia, Panama, Suriname, Armenia (maybe), Ecuador, Nicaragua, Honduras, Guatemala, Paraguay (maybe), Zimbabwe, Azerbaijan, Kazakhstan, Uzbekistan, Kyrgyzstan, Turkmenistan, Costa Rica, South Africa, and Northern Cyprus (the latter not recognized by Western countries). I have probably inadvertently left off some others. (The World Factbook reports Paraguay is 95 percent mestizo and five percent other. I don't know what that other five percent is.) I won't include White Russians in Israel since they pass and self-identify as part of the Ashkenazi Jewish majority.
What important characteristic do the above countries have in common? With the plausible exception of Costa Rica, they are all terrible places to live for ethical, non-wealthy, civic minded individuals. Costa Rica owes much of its semi-development to White tourism, White investments, White technologies, and low levels of militarism.
Unlike Costa Rica, Western countries with increasing racial diversity are all ruled by multiculturalists devoted to police state militarism, especially Sweden, Russia, and several NATO nations.
The counter argument: thousands of additional factors cause those lands to be terrible. Most were not settled by Northwest Europeans. Northeast Asians and Brahman Caste Indians will pick up where whites left off.
The counter counter argument: racial diversity and cultural Marxism make those thousands of additional factors worse, especially dysgenic breeding and bait-and-switch-divide-and-screw politics. Northwest Europeans failed to stop mass failure in Zimbabwe and South Africa, the two white minority countries settled by Northwest Europeans. Despite their high IQs and work ethic, Brahmans and Northeast Asians devote themselves to egoism and other unethical causes. Numerous countries have Brahman or Northeast Asian minorities combined with low IQ nonwhite majorities--those countries stink, except a plausible few with massive earnings from natural resources such as Trinidad and Tobago. Western countries are also infected with more cultural Marxian demagoguery than the White minority countries listed above, making mutually destructive conflicts more likely.
The takeaway: no one with a smidgen of ethical character should try to make White majority nations into White minority empires. The probabilities and negative expected values of dystopian results are too damn great.