What factors contribute to the fact that only a handful of countries manufacture aircraft jet engines?

Upvote:9

The premise of your question is false. Here's a brief (and incomplete) list of current jet engine manufacturers:

I have no idea why jet engine manufacturing (or lack of) would be connected to WW2, at least in the way you seem to imply. In any case, several companies that are based in the losing side of WW2 are key players in aerospace and if they build rockets, satellites and space station components, who cares if they are building jet engines or not.

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