USSR, Cuba, North Korea, Venezuela, Argentina, Bolivia, Peru, India, Vietnam, China, Baltic States, Czech, Hungary, Romania, et al to name just a few have all had identical results.
Venezuela is a perfect modern day example. They were once one of the wealthiest nations in the world. They have the largest sources of oil per capita in the world by far. It is also of the best grade. They have ample other resources and are located in a key geo-political area. They had a very high standard of living under capitalism. Within a very short time after experimenting with socialism they took a dramatic turn. Conditions there now are some of the worst in the world. The people can't even obtain toilet paper, let alone food. Even collecting rain water in a barrel is considered theft of the governments property.