Exclude locations from real-time shipping

I operating from the US and would like to use real-time rate calculation for FedEx Ground shipping within the US. That is easy enough, but I don't want ground rates to show up for Canada, and I would prefer that they did not get quoted for non-contiguous states and territories. Is there an easy way to accomplish this?

When selecting the service in the settings tab of the shipping method setup, I'm offered both “FedEx Ground” and “FedEx International Ground” I do NOT select international ground, yet rates are still quoted for Canada anyway. FedEx tells me that this is an issue with CS-cart. But I have the exact same problem with my current X-cart site.

Anybody know the solution?

Thank you, Robb