At the end of the bipolar Cold War era that was dominated by the rivalry between the United States and the Soviet Union, many people either hoped or feared that a new unipolar world dominated by the United States had come into being. From the beginning of the twenty-first century, though, the ability of the United States to act as a unipole was challenged by several factors.
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Mark Katz: Great power clashes will reshape America
Flags of NATO member countries line the Mall in central London on Dec. 3, 2019, ahead of the NATO alliance summit.
