o.o ehhhh...?
Anyways, put simply, at hte moment Britannia controls much of central Europe and the Strait of Gilbatrar, while Arcadia controls Spain adn France. We have no interest in North America, while we want to prevent any enemy dominance in Europe and Africa. While the Hansa will provide a sea buffer zone from the Russians and Polish and German forces as a land buffer zone, we need to keep the meditteranean our own. If we ally, then all of Europe will be in our hands, and thus most of hte developed nations as well as the former HQ of the UN.