I can't easily find any mentions of the US using military force to compel Palau to submit. It's independent since 1946 or so, and has a comprehensive treaty with the US. Can you please give some keywords or dates of the enforcement actions you allege to?
Re:Why Not Mars
by dragonwriter on Monday January 02, 2023 @05:10PM
(#34224377)
GP gave Palau, Micronesia, and the Marshall Islands as examples of territories the US allowed to become independent without trying to crush them economically or militarily, so your question seems... misplaced.
The US did it for the Federated States of Micronesia, Palau, and the Marshall Islands in recent-ish years, why wouldn't they do it for Puerto Rico if they wanted to?