This is a big misunderstanding of US taxation. Every US citizen must file their taxes on income earned anywhere in the world, even if not earned in the US.
However, for most people, it is very unlikely to actually pay any additional tax to the US government.
If you have any kind of saving or investment outside the us, say, a pension fund or a mutual fund, then you do owe quite a bit even if you live in the US (more if you don't). Almost all of these investments/funds are a PFIC by US rules, which means a world of pain - to the point that over 20 years you are likely to have to pay more in taxes than however much money you have there.
After you make $100k, there is also the foreign tax credit. In most countries, you don't need to bother with the foreign earned income exclusion unless you are not paying tax at all.
This is a big misunderstanding of US taxation. Every US citizen must file their taxes on income earned anywhere in the world, even if not earned in the US.
However, for most people, it is very unlikely to actually pay any additional tax to the US government.
https://www.irs.gov/individuals/international-taxpayers/u-s-...
"Your worldwide income is subject to U.S. income tax, regardless of where you reside."
But there's the foreign earned income exclusion:
https://www.irs.gov/individuals/international-taxpayers/fore...