Most of the world’s people, resources, and economic activity are not in the Western Hemisphere, but in the other hemisphere, particularly Eurasia. Consequently, a key element of U.S. national strategy, going back many decades, has been to prevent the emergence of a regional hegemon in one part of Eurasia or another, because such a hegemon could deny the United States access to some of the Eastern Hemisphere’s resources and economic activity.
I guess they don't know they are not supposed to admit this.
http://www.usni.org/magazines/proceedings/2012-01/special-us-grand-strategy-and-maritime-power
