Quotes

"[America] goes not abroad, in search of monsters to destroy. She is the well-wisher to the freedom and independence of all. She is the champion and vindicator only of her own. She will commend the general cause by the countenance of her voice, and the benignant sympathy of her example. She well knows that by once enlisting under other banners than her own, were they even the banners of foreign independence, she would involve herself beyond the power of extrication, in all the wars of interest and intrigue, of individual avarice, envy, and ambition, which assume the colors and usurp the standard of freedom." -- John Quincy Adams (1767-1848) 6th US President

"The great rule of conduct for us, in regard to foreign nations, is in extending our commercial relations to have as little political connection as possible... Why, by interweaving our destiny with that of any part of Europe, entangle our peace and prosperity in the toils of European ambition, rivalships, interest, humor, or caprice?... It is our true policy to steer clear of permanent alliances with any portion of the foreign world." -- George Washington (1732-1799) Founding Father, 1st US President

Sorry Mr. Presidents, here's the latest from Wikipedia: 

The military of the United States is deployed in more than 150 countries around the world, with over 156,000 of its active-duty personnel serving outside the United States and its territories and an additional 70,000 deployed in various contingency operations as well as through military attache offices and temporary training assignments in foreign countries. US troops are spread across the globe: approximately 65,000 are stationed in Europe; approximately 80,000 in East Asia and the Pacific region; over 5,000 in North Africa, Southwestern and South Asia; over 1,700 in the Americas; less than 400 in Sub-Saharan Africa; and less than 100 in states of the former Soviet Union