It's no secret that the U.S. spends more on its military than any other nation and over four times what the second place country, China, spends. So it's no surprise that the U.S. has the largest presence outside of its borders.
While the rest of the world maintains about 30 overseas bases combined, the U.S. has 800 that we know of. These range from huge installations with thousands of troops to tiny airfields on remote islands.
This Vox video explains how these bases were set up, how they're funded, and more.