Eh Buddy Hoser

As a general rule, people with US citizenship working in most other countries still have to file US taxes, but they end up owing nothing. There's a big exemption for wages earned in other countries, so unless you're making a lot of money and simultaneously living in a place with very low taxes, your payment will be $0. This sometimes affects say bankers who move to Switzerland where they make a lot of money and don't pay much in taxes. But, for most jurisdictions (including Canada) the taxes are more-or-less on par with the US or higher so you don't end up owing anything.