The Soviet Union, on the other hand, certainly had a parasitic relationship, and due to that (not only), it was a failure.
Sorry for responding to a post that's days old... but this is not true.
Boris Yeltsin, and the idiots around him, organized the "independence" (from what?) of Russia - in part due to a mistaken belief that Russia was pulling on its shoulders the weight of the other republics and other socialist "brothers" around the world.
If you look at trade balances, and investment flows - the Soviet Union was a massive loser from its "empire".
We fed Cuba and half of Africa, and supplied all of Eastern Europe with dirt cheap fuel.
We weren't capable of making anything ourselves (that wasn't a tank or a rocket), so we had to buy everything from our "brothers". Polish furniture, German lederhosen, Czech radiosets, and so on and so forth.
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Did we rape your oil fields? Leave your coal seams barren? Export all your forests? Settle millions of Russians in Prague and Warsaw and Sofia - while sending the former inhabitants to live in the fields?
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The Soviet Union and its global empire were a failure not because we were "parasitic" and America was "symbiotic", but because the economic model we were pursuing was f*cking retarded.
Everybody that switched away from that model (China, Vietnam, and even us) - have since posted growth results that dwarf current Western growth - albeit this has come from a very low base...
But it shows that what was stopping us was a socialist structuring of the economy and fiscal policy.