Superman is Canadian. That's what he is to me. There are lots of Canadian content connections. Smallville has often been filmed in Canada--and Kansas is a retcon anyway. One thing they could do is establish that the Fortress of Solitude is in Canada. I always assume it is because the high north of North America is mostly Canadian territory. I have seen some maps that put it in Greenland or somewheres else, but Canada (Nunavut) makes the most sense to me.