American power was indisputable in the 20th Century. The US helped win two World Wars, developed a resilient economy, and in 1991 emerged from the Cold War as the sole global superpower. But today the country is facing unprecedented polarization caused, in part, by wars in Iraq and Afghanistan, the 2008 financial crisis and the amplification of disinformation on social media. On GZERO World, Ian Bremmer asks former Obama Deputy National Security Adviser Ben Rhodes whether the American Century is truly over, or if there's anything we can do to restore the country's reputation as a "shining city upon a hill."

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U.S. Army soldiers take part in a U.S.-South Korea joint river-crossing exercise, which is a part of the annual Freedom Shield joint military training, near the demilitarized zone separating South and North Korea, in Yeoncheon, South Korea, March 14, 2026.
REUTERS/Kim Soo-hyeon

The decision deals a blow to a decades-old alliance: South Korea relies heavily on US deterrence against its nuclear-armed northern neighbor and hosts 28,500 American troops.

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