It will depend upon the type of return filed in the US. If you are a citizen and are required to file taxes in the United States, you should be able to claim the foreign tax credit on your US tax return when you prepare it for any income that is taxed both in the US and Canada. Please see this link for additional information on the foreign tax credit.
If you have already filed your tax return, you will need to amend your return to claim the foreign tax credit. Please see the following links to guide you through this process.
How to amend your return
How to claim the foreign tax credit
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