That makes it seem like you think going to war is generally a good idea. Yes, the USA came out of the Second World War better and more powerful than it went into it, but this is very much the exception, and has only a few other examples in history (the Eighty Years War being another one, which comes to my mind easily because I happen to live in the country that came out far better off than it went into that one).

Quite probably, Nazi Germany would have been defeated by the Soviet Union even without American aid. But, of course, that would also have lead to a world, or at least a Europe, ruled by a single dictator, and it's very debatable whether the average person would have been better off under Nazism or Stalinism.

Is it the same country, though? I'd say the China that was saved in 1945 is now limited to controlling Taiwan, since the principal ally of the western world back then was the Kuomintang, who lost the Chinese Civil War to the Communist side and then withdrew to Taiwan.