The Americanization movement was a nationwide organized effort in the 1910s to bring millions of recent inmigrants into the American cultural system
The main difference between both nations was their political views. America was and is a capitalist country and as we know has many freedoms. The Soviet Union on the other hand was a Communist country that gave no rights to its citizens. The United States wasn't happy with that. Also, after WWll, the U.S. provided aid to war torn European countries with the Marshall Plan but the Soviet Union hated this because they wanted to take over those countries.