And yet, more USians move to my "poor" country than the other way around. Make of that what you will.
In any case, don't be too sure about your claim. According to <https://ourworldindata.org/where-do-migrants-live-and-where-...>, 170K Spanish-born live in the US. By contrast, 69K US-born live in Spain <https://ourworldindata.org/where-do-migrants-live-and-where-...>. Given that the US (341 million) has 7.25 times Spain's population (47 million), this means that a Spaniard is 17-18 times more likely to move to the US, than an American is to move to Spain.
Using the Our World in Data figures, a Singapore-born person is about four times more likely to move to China than a China-born person is to move to Singapore.
That does not seem like an unreasonable ratio, given that a) Chinese are not nearly as free, whether economically or politically, to emigrate, b) those Chinese who have the money and connections to leave are likely going to be in the large cities that offer good living standards, and c) China is going to have, from sheer size, aspects that will appeal to Singaporeans regardless of per-capita economic disparity. Put another way, if Chinese were as free to move around the world as Singaporeans, there would surely be many more China-born people in Singapore ... perhaps four times as the current 530K.
By contrast, the US and Spain are fairly comparable in terms of their citizens' freedom to move about, so that factor can be eliminated from the comparison.
The american dream is dead, US is a country for working, not for living.
Definitely a testament to each country too - presumably they have a fairly wide choice. They wouldn't go somewhere they disliked the culture that much. We know how discerning US folk are.
Retirees and people who already made money to outbid the locals on housing and purchasing power.
Why would they move to a more expensive country where they'd feel poor?
Think about it... a hint, it's not about money.
By comparison, try emigrating as a poor person from a poor country with a weak passport. Americans are playing life on easy mode but they complain the most.
Anyway. New world order. USA hegemony is going way.
I guess USAians are beginning to find out how we in the UK felt about the loss of our empire.
(Don't know your country to know if that's true or not, but it's a possibility)
My country offers them both, people from lots of countries como here looking for money and also for a better way of living.
The lesson explains itself.