You can not use a Canadian SSN to work in the US
4000 points is the largest you can buy in the US.
This is the most updated prices: 400 Microsoft Points - $4.99800 Microsoft Points - $9.991600 Microsoft Points - $19.994000 Microsoft Points - $49.996000 Microsoft Points - $74.99Or you can buy a code from a store and redeem it
about 10 US dollars.
The Escalation Map Pack on Xbox Live is priced at 1200 Microsoft points (US)
If you are referring to a pre-paid card, then no. Your Xbox will tell you that the points are not valid if you use foreign points.
800 Microsoft points are worth 10 US dollars.
the Canadian has to be married to the American
yes
$30 us / ~£18.60 UK/ €30 eu
Yes. A Canadian can work in Canada, it makes no difference that he or she has permission to work elsewhere.
Yes, and many do.