Buy him a subscription to
Shonen Jump, produced and distributed in America by Viz Media, Canadia.
It's not American comics, to be sure, but most of what's in print in the issues, I'd think, is what the average teenager already sees plenty of on the TV, like anime, and in video games.
Or, you can quickly peruse the graphic novels section of your local book emporium and see what's readily available, which can also pique his interests.