This is a common issue,
the US Creditor will likely sue you, however they will have to sue you in your last place of residence int he US,
they would not sue you in Germany,
if they obtain a US judgment against you, they would only be able to
take US Assets not any foreign assets or foreign accounts,
they would not be able to enforce the judgment against you in Germany,
If you do not have any last US address, they would not be able to sue you in the US either.
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