Let's hope Canadians Daniel Nimick, TJ Tahid, Kevaughn Tavenier, James Cameron, Kwasi Poku, Rayane Yesli, Max Ferrari, and Noah Abatneh who are all young guys....are either good enough to get a move beyond MLS or a MLS team is willing to use an international spot on them.
From history and off the top of my head, Andre Hainault, Steven Vitoria, Nana Attakora, Marcel De Jong, Kyle Porter, and Zorhan Bassong* are guys who played on non Canadian teams and counted as internationals. I'm not sure if guys like Bent, Watson, and Jakovic counted as they were drafted.
But a 10 year span and there's only been about 5 signings from American teams. Gambia has almost double that number.