The idea that the United States is the world’s older brother, ready to take care of any bullies that show up on a street corner, is relatively recent. For the first 165 years of its existence, the United States had one such treaty, signed with France during the Revolutionary War, according to Beckley. After World War II though, organizations such as NATO, formed in the early days of the Cold War, obligated the U.S. to jump in if a member nation were to be attacked.
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