The announcement by USOC CEO Scott Blackmun came under a summer sun at Santa Monica Beach, where the city's plan calls for staging beach volleyball on the site where the sport was founded.
"I want to thank Los Angeles for standing up, once again, as America's bid city," Blackmun said, adding that the city's proposal squares with the Olympic movement's goals of watching the bottom line while investing in projects that dovetail with community needs.
"This is a quest that Los Angeles was made for," the mayor said. "This city is the world's greatest stage."
Earlier Tuesday, the Los Angeles City Council cleared the way for Garcetti to strike agreements for a 2024 bid. The 15-0 vote came about a month after Boston was dropped from contention amid shaky public support and questions about taxpayer spending and liability.
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Garcetti has said Los Angeles, home to the Olympics in 1932 and 1984, would stage games that are both spectacular and profitable.
A key issue has been whether approval of the resolution by the City Council would saddle Los Angeles with potential cost overruns for an event that historically runs over budget.
Council members were assured repeatedly that the approval starts a negotiation with Olympic officials and does not commit taxpayers to future spending to stage the Games.
"This is the engagement, not the wedding," Council President Herb Wesson said.