Get our own house in order first, then write a book about it and ship it out for free. If they don’t listen, it’s their loss. You won’t right every wrong nor mend every fence. It’s impossible, and the price you pay for constantly trying the same old failed thing is felt at home by some other minority group that could have used the resources which were squandered on faraway struggles of the cold or hot variety.
Considering the British had a huge colonial empire, the US had brutal segregation, rampant anti-Semitism ( so much so they refused ships with Jewish refugees and sent them back to their death in German occupied Europe) and eugenics experiments, and the USSR( the third main country in the Allies, mostly by necessity, but nonetheless) was pretty much as violent to their minorities as the Nazis were... What could any of them say without being blatantly hypocritical?