Jan--sadly, your and my home-state of California does still allow child marriage. In fact, most states do.
Although the minimum marriage age is 18 in most states, exceptions to that requirement in all but six states leave the door open for children to wed. In California, a person under 18 can marry with the consent of one parent and a judge, following a review of the case that includes interviews with the parties involved. The state is one of only nine in the nation that do not set a minimum age for marriage. There is no federal law banning child marriage.
...A recent study ... conducted with McGill University and other research entities estimates that almost 23,600 child marriages took place in California between 2000 and 2018. Those figures were based on U.S. Census Bureau data and the number of child marriages reported in other states.
Funded by the Bill & Melinda Gates Foundation, the study found that the vast majority of minors married across the country were girls wed to older men (on average four years older). Most were 16 or 17 years old, but more than 9,000 marriages involved children under 16. These included 1,233 children age 14, 78 age 13, and five 10-year-olds.
https://www.calhealthreport.org/2021/09/10/california-laws-dont-prevent-minors-from-marrying-adults/