OB-Wan,
You're correct; you would need to close the US account to open a Canadian one if you're planning on using the same email address. You might consider withdrawing the funds first, and then either keeping them or adding them to your Canadian account once it's up and running.
You could also consider sending a Personal payment over to your new Canadian account, but you might incur some fees for sending money internationally and lose a small amount (around 1%) in the process.
Thanks,
Adrian
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