Beyond what you say about Stalin or Lenin, and about white vs non-white countries, when a society becomes more liberal or leftwing, its demographics and natural resources then do take on even greater importance.

However, Argentina, which has fewer non-whites than the US does, has been fucked for over 90 years by Eva-Peron-type liberalism. That nation is always going through phases of a lot of crime and financial crisis.

In terms of Venezuela, that nation has vast oil wealth. But its Chavez/Maduro left has turned it into a mess. It might just as well have only the brine of sea water as a natural resource.