How are you this backward in some places?

Wait till you learn about USA's child marriage issues.

In some states, it is possible for a minor to legally marry even if they are below the age of sexual consent in that state. Between 2000 and 2015, at least 200,000 minors were legally married in the US. 86% of these marriages were to an adult. About 5% of the minors were aged 15 and under meaning they would be under the age of sexual consent anywhere in the USA.

17 states have no minimum age for children to marry In some areas minors cannot legally divorce, leave their spouse, or enter a shelter to escape abuse.

https://en.m.wikipedia.org/wiki/Child_marriage_in_the_United_States