And what makes you think these ideologies are less spread out in the USA.
Racism, eugenism, totalitarian ideologies... etc were also widespread in the USA in the 20s-30s and only went down due to Nazis exemple and providing a pretext to Communist attacks.
ITTL, there will be no civil right movement and any agitation by the Negroes in the South will be put down by force. ( remember that there will not be so many black veterans, for one thing )
First of all, I wouldn't say that "totalitarian ideologies" were widespread in America in the 20's-30's. But why doesn't the US turn fascist?
1. Things happen differently in America. America doesn't turn to Fascism as a solution to the Depression,there is instead the New Deal (which I'm thinking of making more socialistic to possibly heighten the ideological contrast between America and Europe), there are no Communist revolutionaries wreaking havoc in American cities (US Communists aren't too receptive to Trotsky's call for world revolution), and there is no war against the Soviet Union. There is instead a war against Imperial Japan, who like Nazi Germany, also happens to be racist, totalitarian and in favor of eugenics. American troops in China means more exposure to racially motivated Japanese atrocities against the Chinese like the Rape of Nanking, etc.
2. As the Cold War with Europe heats up more and more, a similar thing happens with Americans turning to the Europeans' racism, eugenics and use of apartheid with increasing disgust and realizing their own wrongs in race relations, leading to a much earlier Civil Rights movements in the 50's, with pro-Civil Rights politicians asking "What are we? Europeans?"
Perhaps the SU could be defeated by both sides, and split into two parts (Like Germany was), with Europe having the European part, and the USa the Asian part (this also means a strong US domination of that area, perhaps after USA-Japanese war). The Middle East would then be the main battleground between both ideologies.
Great idea for Russia. I see the ME as being European dominated the only American ally being Iran, same goes for Africa with the only American ally being Liberia.