Clearly Americans are ok with it, because that's how they vote. West Virginia didn't raise the age of marriage to 16 until 2023, after years of staunch Republican opposition.
The age of consent for marriage is 18. A marriage license may be given to a person at least 16 years old given consent from their legal guardian and that the person they are marrying is no more than 4 years older than them. [1]
But yes, until 2023 there was no age requirement as long as their legal guardian consented. [2]
Your issue raised here really boils down to whether its okay for parents to determine what is best for their child or if the state needs to decide that.
[1] https://code.wvlegislature.gov/48-2-301/ [2] https://theamm.org/articles/1625-west-virginia-updates-age-r...
Why?
Also its interesting that you are only concerned when the under 18 individual is a girl.