On one hand you seem to complain about racial division and "nazis". On the other hand you seem to find disdain for multi-ethnical nations(like Brazil with it's many problems like you mentioned). How are you going to have it and whats your solution?...
"Nazis" as in normal people who want some control over their territory and genes - I never complained about them.
A solution to the racial problems could have maybe been found in the 60ies but nearly all "western" nations(besides for example Australia) had already been opened up by "traitors" who disguised the genetic holocaust for Europeans in humanitarian and/or economic clothes. Numbers were still low and all governments should have focused on hermetically closing the border to any 3rd world immigration and created repatriation plans for various groups as in "get money and fuck off".
Decades later of globo homo, immigration and other disasters it's a vastly different game.
There's a part of the "pseudo settlers" that would piss off on their own given help & a chance but the vast majority of unnecessary guests will never leave unless they would taste cease of all government support or extreme violence. The UN would most likely bomb nations that successfully got rid of "long term settlers" though.
It's a pity that instead of letting a few hundred capable 3rd world folks into the west over the decades, millions of low IQ drones have been funneled in and nearly all are, by nature, fast breeders which have successfully sucked the system semi-dry. The average Euro tax payer has "cheerfully" financed his or her own demise... but given many peoples dishonest views on immigration(or whatever stupid term this war is called) I can't feign much empathy.
For Americans a form of segregation might be possible due to the landmass but one still had to control the borders. For Europe it's not possible to retreat so a war maybe necessary where the biggest opponent would be turkey and some "banana"-countries. Russia would most likely support the mooslims so I see not much chance for regaining European soil.