You state that you do have a sch B and you have no foreign assets. Can you please check any mutual funds you own to see if they have foreign assets? My guess is that you have some foreign dividend causing this situation. Just $1 in foreign dividends will create this issue. You can check your 1099-DIV for foreign income and tax paid.
See Instructions for 1099-DIV for more information on foreign income and taxes.
@PVM2
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