No one expects America to turn communist today, not in 10, 20, 50 years. The red scare and capitalist propaganda is so bad it would be idiotic to assume America as a socialist frontier.
But:
We have to work against red scare and change the people, not the government;
We should develop revolutionary movements in other parts of the world. The successes of USSR in the 30s have seriously affected people everywhere, including America.