To be fair to the U.S. every powerful country makes a lot of enemies and throughout history there has always been some country that spends a large portion of their money to protect their interests and expand their power base. Egypt, Rome, China, Spain, Britain, France, Germany, The Ottoman Empire, Persia, etc. There's always someone globally at the top who needs to spend a large portion to protect entrenched interests and they inevitably fall because those entrenched interests forget that a country only states at the top if it's willing to make new and more powerful interests.