It's not like you need to worry about an invasion of GB or your caribean islands, so send everyone to your danger area -Canada and the 13 colonies.
How are your alliances? I've always treasured my Alliance with the Iroquoi and they've stuck by me. Make sure you give them millitary access to your provinces.
As the game begins, you should have enough troops from your European army to allow you launch a naval invasion of Quebec. As of then, you've got them on the back foot in NA.
The other threat to you in NA is the Cherokee. I've normally dispatched them before taking Quebec & Montreal in my games, so if they haven't already DoW'd on the 13 colonies, it may happen soon...
Good luck!
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