Do you realize how difficult it is to move from one country to another? It's expensive as hell, and if you're a US citizen you still owe taxes on money you make while living abroad.

Additionally, the cost to renounce US citizenship is the highest in the world by a large margin. $2350 + exit taxes, as of this writing. https://common.usembassy.gov/en/renounce-citizenship/

Next highest is Jamaica at $1040 as of this writing. https://congenjamaica-ny.org/renunciation-of-jamaican-citizenship/

The USA is an inescapable hellhole for the poor, so think for a few seconds before you make another shit comment like this.

Primarily because it's really difficult to move countries. Even when an other country is "better", by whatever metric you may choose, the high switching cost makes the move worse for individuals unless staying in a country is really really bad. That threshold is typically when subsistence in the country of origin becomes untenable, often due to war or famine.

Half the population has less than 1000 bucks in savings and doesn't have a degree like an MD that would bump them to the top of the list as far as citizenship elsewhere. How do you propose people make this happen? The people who are most disadvantaged are those who would have the hardest time doing so.

Where else is there really to go? You have to be rich to expatriate.