Affirmatively, international treaties like the Kyoto Treaty do undermine the sovereignty of the United States as an independent nation. This is so because, after the ratification of an international treaty, it becomes a law superior to the laws of Congress, which governs the life of American society immediately, but which was dictated by other nations and not by the United States Congress. It is, in this way, a law imposed by other nations on the United States, thereby bypassing the legitimacy of Congress to legislate as long as it sees fit.
The positive effects of getting California is that it's closer to Asia, and California side of the nation at the time could have open territory to conquer.
