re: US needs to stop allowing dual citizenship, you are either American only or not.

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Also for permanent residents who are not citizens, and I saw a lot of professors who do this. They've been in the US for 5, 6, 10, or more years and refuse to become citizens, yet keep working here. You either need to go through naturalization after a certain amount of time or GET OUT. Don't want to be a citizen? Fine. Go home then.

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I think you'd have less cases of this if the US did not tax its citizens on worldwide income. Only the US and Eritrea does this. Even if one ends up not paying US income tax from foreign tax credits, it's an extra burden of filing an extra income tax return (for some expats living abroad it can be complicated and costly just to file the return).

As an aside, FATCA is a terrible law that I was hoping the Trump administration would eliminate. It can make banking as a US citizen living abroad difficult.