If you are a US citizen the US taxes your world-wide income no matter where you life. If you make enough you need to file a US return. There are various things (treaty provisions and the foreign tax credit - FTC) that give you credit for any foreign tax you paid and will usually reduce or eliminate any US tax due for a US Citizen living overseas without a lot of US income.
To see if you made enough to have a filing requirement, see
https://www.irs.gov/individuals/check-if-you-need-to-file-a-tax-return
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