The historic event on Tuesday with Palau, the Marshall Islands and the Federated States of Micronesia renewed Washington's ties to the states.
But a joint-statement released later made no specific mention of climate change, a key issue for Pacific Island states.
Amy Searight from the Center for Strategic and International Studies in Washington said the US had instead focused on security cooperation.
"Overall there's not been a huge change in approach. For the Trump administration, the real challenge is climate change, the number one priority obviously for the Pacific Island nations. And the Trump administration is doing nothing on climate change so that's a big mismatch in priority."