China and Vietnam, left mostly to their own devices, have maintained a positive trajectory and retain control of the commanding heights of the economy. Vietnam and China successfully repulsed Western occupiers which is what gave them a chance at independent development.
Every other attempt at a different path elsewhere was undercut by military coups, invasions, economic blockades. One would hope that communism/socialism would be robust to destabilization efforts, but it was not the case. Capitalism also took time to develop, such as various attempts in the Italian city states before first taking root in Denmark. Hopefully, a new system of peace and cooperation will replace our brutal empire.
So you are saying an order was established...
I think you're the type of person that when wrong sorta talks about a bunch of adjacent topics to try to avoid the point of admiting that you were wrong.
The Sino-Soviet bloc and the Warsaw Pact controlled roughly a third of the world's population, an immense percentage of the Earth's landmass, and practically every natural resource required for autarky. They had nuclear parity, massive industrial bases, and their own closed global trading network (COMECON). If a system with that level of geographic, demographic, and military shielding cannot sustain itself, it is not due to a lack of opportunity.
It is prima-facie absurd to claim "it just wasn't given a chance"