Communism, not Fascism, or to protect workers’ rights if you go back far enough. We only got involved in fighting fascism because we were drawn into the war, otherwise it’s never been that big of an issue to Americans and many schools aren’t even allowed to teach about it anymore because “kids shouldn’t have to feel bad about something like that” or whatever excuses the far right is currently using to prevent their schools from teaching about Anne Frank, concentration camps, slavery, anything else they want to implement themselves.