This is historically illiterate. WW1 was a war between Imperial powers both sides of which were entirely white. WWII was caused by a German supremicist movement opposed to all non-Germans — it’s not as if the Polish are non-white.

White supremacism is supported by a fraction of a percentage of white Europeans. Support for Islamic fundamentalism is substantially higher in the Muslim world.

(Plenty of Europeans are opposed to large scale immigration, but you’re not conflating that with white supremicism are you?)