This is an area of great natural resources including vast reserves of oil.
If it were in the hands of the Germans, we would probably not have been able to contain them from their ambition of world conquest and domination.
We handily defeated the commies in just over 40 years!
Handily???? Ummm ... you have an exceptionally rosy view of the latter half of the XX Century. You might also want to refresh you memory regarding the government of the Peoples' Republic of China.