Amtrak now has a reasonably nice glossy print magazine called The National. The current issue features a half-page color advertisement from the Citizenship by Investment Unit of the government of Antigua and Barbuda, promoting a program established in 2013 that offers citizenship in that Caribbean island nation in exchange for a contribution of $100,000 to the country's National Development Fund. Benefits, according to the ad, include "visa-free access to more than 150 countries, including the United Kingdom and Schengen area" as well as "no tax on worldwide income, inheritance, capital gains or investment returns."
According to the most recently updated report on the Citizenship by Investment Unit's website, since the program's inception, 1547 individuals have received citizenship via the program, including 39 from the United States and 625 from China. The United States makes it hard to flee by imposing an expatriation tax on exiting Americans. Whoever placed the ad in the Amtrak magazine, though, probably figured it would reach an American audience, not just Chinese tourists. And Antigua and Barbuda allows for dual citizenship as well, so becoming a citizen there doesn't necessarily even require renouncing American citizenship.
Whenever politicians talk about raising tax rates, it's worth remembering that capital is mobile and so too are wealthy people. America has a lot to offer in terms of rule of law, health care, educational institutions, and culture. But it has lots of competition, too.