Molson, Kokanee, Sleeman, Alexander Keith's, Coors and Moosehead are all made in Canada . . .
Molson is owned by Coors. Coors is American. Sleeman is owned by Sapporo. Keith's and Kokanee are both owned by Labatt's, which is owned by InBev (Belgian). Granville Island is owned by Molson (Coors). Moosehead is actually Canadian though.
You really have to go smaller to find Canadian-owned breweries. P49 is fucking great if they can find it.