This is probably why he wants it:

Unlike American citizens, gold card holders will not have to pay taxes to the U.S. government on their overseas income.

Not sure if that applies to us citizens with gold cards though.

One other thing to add: permanent residency is issued at the province level.

If you’re planning to move here permanently and don’t speak French, don’t move anywhere in Quebec. It’s the only province that requires French language competency for permanent residency. In other provinces, you can acquire PR with just English.

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