As the United States marks its 250th anniversary, it stands as the world's largest economy and commands the most powerful military. Yet confidence in its institutions has eroded, political divisions run deep and many question the nation's trajectory. From symbolic shifts on the White House grounds to the rise of China and the heavy cost of global leadership, Genevieve Woo and Senior Correspondent Simon Marks examine what these domestic and global tensions reveal about the state of the superpower.

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