"We kind of got in a little bit of a hole there," Clark told reporters of the second-quarter.
"And then we came back in and kind of dug ourselves out of it.
"That run we went on into halftime and then came out in the second half and really just dominated from there."
Playing in their first ever World Cup final, France was seeking revenge for their one-point loss in the gold medal match at the 2024 Paris Olympics but lost their composure as the Americans turned on the afterburners in the second half, committing 16 turnovers.
France's Gabby Williams, the player of the match in their semi-final win over Germany, scored an impressive 16 points in the opening half but added just four more after that.
The US, the huge favorite that is used to dominating World Cups and the Olympics, came into the game looking vulnerable, having come close to defeats against unheralded Italy and again against Spain in the semifinals.