I am receiving some inheritance money from Europe from my mother who passed away.

I have become a US citizen.
Do I have to pay taxes on any of this?

Redundant question; my answer is below.

There will be no estate or inheritance taxes on the federal level.

There MAY be an inheritance tax at the state level; a phone call to your state department of taxation should provide an answer to that question.

If there is a wire transfer from your mother's estate, Form 3520 may need to be filed to account for the transfer amount, but that is an information return only; NO tax will be due.