The American century is over. As WW1 ended the 19th century. Globalizing tech our long culture wars, and the pandemic ended the American Era.
Only a handful of nations scattered around the world now accept U.S. passports. See map. This may be slow to change vaccine or not.

Historians might mark the Moon landings as our height.
Our end are effects of changing world economies, and internal disunity.
The long culture wars driven by ethnic rivalries, and vast economic injustices. These worsened by the Trump discontinuity, and official in-action on the Pandemic.

These things showed the world that they no longer needed us.
That they could, and are now adjusting their economies, and alliances. They are doing this, and are moving on,...without us.