Garber hailed the impact of the CWC.
"Whenever you do something new that changes people's perspective on international competition, there are always questions about how it will come together and what impact it will have," he said. "We always have a bit of a chip on our shoulder here in the U.S. soccer business."
He also said he was proud of the performances the participating MLS clubs - Inter Miami, Seattle Sounders and LAFC - although Lionel Messi's squad was the only one of the three to win a game and get out of the group stage.
"It surprised a lot of people." he said. "For decades, we've been trying to show the world we can be an influential, meaningful part of the global soccer conversation."