not 9 years old, but .....still underage
Between
2000 and 2018, nearly
300,000 minors were legally married in the U.S. Some married as young as
10, though cases at that age are uncommon and typically involve exceptional legal or judicial permission
More than 200,000 children under 18 have been legally married in the U.S. since 2000. This is what we know about them.
www.pbs.org
From wikipedia:
en.wikipedia.org
The country has seen hundreds of thousands of child marriages since 2000. As activists push for new laws, an unlikely cohort stands in their way
www.theguardian.com
However,
four states—California, Mississippi, New Mexico, and Oklahoma—
do not specify any minimum age, meaning in theory, younger than 18 (potentially even 10 or 11) could be married with consent or court approval