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A US citizen is required to report all of their "worldwide income" on their US Income Tax Return.
If you earned income in the EU and paid taxes, you would need to report the income on your US return. You would be able to take a Foreign Tax Credit using IRS Form 1116. This IRS publication will give you more information about the Foreign Tax Credit.
If you lived abroad while earning the income; you may be able to exclude the income from your US return if certain conditions are met. This IRS Publication may be helpful regarding the income exclusion.
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