The facts that you presented would not support the charge that you received. It can be challenged after the evidence is provided to your tourney as part of a challenge to probable cause.
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An event in Iowa could not support a criminal charge in Minnesota. A driving related crime or license revocation in any state could trigger a loss of drivers license in Minnesota, however. I would suggest that you look at the letter you received to determine the date, location, and general nature of the incident alleged, as well as who sent the letter - a court, a drivers license agency, or other, and what state is was sent from. You might want to call a lawyer, with the letter in your hand for reference.