U.S. foreign policy comes in phases. From the end of World War II to 1972, its goal was to confront the Soviet Union and affiliated communist governments. Things changed a little in the early 1970s, when the U.S., weakened by the Vietnam War, began to work with China against the Soviet Union to eventually reach a detente. This lasted until 1991 and the collapse of the Soviet Union. From the early 1990s to 2001, Washington fixated on leading a global, peaceful world order. That, too, changed on 9/11, after which policy revolved around the global war on terror. The wars were costly and minimally effective.
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