The American system of worldwide taxation based on citizenship is extremely strange and shared by just a handful of other nations such as Eritrea, Hungary, and Myanmar. [1] Even more odd was the decision to shift to territorial taxation with the Tax Cuts and Jobs Act of 2017, but only for corporations and only for income earned with tangible assets overseas. [2]
[1]: https://en.wikipedia.org/wiki/International_taxation
[2]: https://www.taxpolicycenter.org/briefing-book/what-territori...