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This is due to Capitalism. You will never be able to have a true socialistic society without it collapsing on itself. this is self evident. The only way a system like that could succeed is if greed was no longer in the human equation. Sense that is impossible, at least for now, this political ideology is naive at best and willful ignorance at worst.

Any evidence to back up this assumption?

Yes they would. They were in poverty well before the imperialists had their hands on poor nations. In fact, everyone was in poverty to begin with. The strongest capitalist nations found success hundreds of years before the others.