Would of course exclude European nations. But some nations with high majority European ancestry other than the US are: Canada, Australia, Argentina, Brazil, Colombia. Brazil is only about 47% European ancestry but that is a whopping 91 million people given their large population. Cuba is about 64% European ancestry, though much smaller in population than Brazil. Highest percentage of population: Australia, 90%, Uruguay 87.7%, Argentina, 85%, Costa Rica, 82.7%, Canada, 76.7%. Highest actual populations, excluding the USA: Brazil- 91 million, Argentina, 34.6 million, Canada 26,9 million , Australia, 20 million, Colombia, 17 million..