St.Pierre and Miquelon, two pieces of land that are part of France but are located in Canada. They rarely are even shown on maps of Canada. There's a reason for this, but I don't know what it is, so I'd be suspicious of them and France.

ALso, the "Gua's": Guatemala, Guam, Nicaragua and Guadalajara. If one of them rebels, I'm pretty sure her sister countries will follow.There's no reason to believe they will cause trouble, but why take chances?