I know it’s nitpicking, but the German one should probably include the Danzig corridor, Alsace-Lorraine, and danish Schleswig. Perhaps South Tyrol and Slovenia too.

I think they referred to the non-existent Chinese navy at the time, not their general ability to wage war. Either China would have been unable to invade the Japanese isles.

I wonder what would happen to a space-faring communist society if it came into contact with a capitalist-like alien society. Would it regress back to socialism upon the reignition of class conflict and national borders ?

I disagree about religion. It should be subordinated to the government. That should stop them from promoting reactionary rethoric. (Assuming the government is half decent in the first place. Otherwise there’s not much difference.)