If this was a game of Risk, it would make perfect sense to mass your troops near the southern tip of South America for a sweep across the Americas and then branch to Great Briton and Ukraine. Having a strong base, as in both the Americas, and then denying your enemy the bonus troops from owning Asia or Europe would lead you on the way to being the Emperor of the world. From there, it is only a matter of time before you conquer the Africans and Australians. Their plan is genius.