There's no country where every single person lives in freedom and happiness. But there are numerous countries that have significantly improved the quality of life for the vast majority of people compared to what they had before, including Cuba, Vietnam, and China.

It may be true that in some cases the quality of life is higher in capitalist countries. But there's a good reason for that! Historically, the countries most prone to socialist revolutions... were countries with some of the lowest standards of living in the world!

Despite this, China has recently eclipsed the United States in life expectancy. If you compare the two countries' life expectancies before the Communists came to power, no one would expect that to happen! Why? Because for the average rural Chinese person, their way of life was virtually unchanged since ancient times with a life expectancy of 35, comparable to that of the Roman Empire.

Anti-communists would have us compare communist countries against either an imagined utopia, or against countries starting from a significantly higher level of industrial development. But those comparisons are not relevant to the question at hand! In order to evaluate the efficacy of socialism, the relevant comparison is the system that actually existed before, and what it was on track to do! And in cases like China, we can clearly see that the quality of life was miserable and stagnant for the vast majority of people, until the communists came to power!

Why do Westerners fail to account for this vital evidence? Because people used to a higher standard of living would take these improvements for granted! For a village tailor, being able to afford a sewing machine could be life-changing - but someone living in the imperial core would have no relevant experience to relate to that! The only thing they would notice is how poor the person still is, regardless of how much or how quickly their life is improving!

Is there a Capitalist country where all people can "live in freedom and pursue happiness?" What does that even mean? What are the solid metrics by which you track that, so you can say a country passes or fails that?

First of all, communism isn't utopian. Even communists don't think it will be some paradise where all worries disappear. You'll still have to fight racism, sexism, bad weather, famines, etc.

But it's often better for an average person from a country of a starting equal level of economic development. You've got to give it the "If I was reincarnated in a random person's body, where would I want to be?" test. US is a good answer, but it's got a way higher level of economic development with a big headstart. Even then, you could end up in the hood and die early and stressed. When you give the test comparing countries of equal starting economic development, it becomes a lot more muddled.

Like, would you rather randomly live in Cuba, or Somalia? The place where you get free education, health care, etc or a place that is also extremely poor but you don't get that stuff? You could reincarnate as some rich, warlord there, but would you want to take that chance when you could reincarnate in Cuba as literally anyone and not be worried about ending up homeless? When giving realistic comparisons like this with proper historical context, and you do it over and over again, they tend to come out on top.