The U.S. State Department made the observation while commenting on reports that Palestinian Authority Chairman Yasser Arafat has agreed to give Prime Minister Ahmed Qurei control over security services.
Qurei had earlier threatened to resign after Arafat refused to share power with him.
But earlier Tuesday Qurei told reporters the differences had been resolved peacefully and he was withdrawing his resignation.
Commenting on the developments, State Department Deputy Spokesman Adam Ereli told reporters the United States wants "concrete actions" and "tangible results" on the ground.
"The results that we want to see are real consolidation of the security services, real authority vested in the prime minister and real moves against the terrorist infrastructure in the Palestinian territories," he said.
"That's really the basis on which we're going to make our assessments, as opposed to who's up, who's down, who's in, or who's out on any given day."