They might.
Contact the MO child support agency for your county.
$2,500
Yes, nationwide.
Pay your child support.
Yes, if one owes more than $2500, then passport will not be granted. Why are you in arrears? see links below
In most cases, no. Child support in Wisconsin ends when the child is 18 and has graduated high school.
No.
By getting the State that placed a hold on your passport to send notice to the Federal government that the matter is resolved.
It depends where you are. In the USA, someone who owes more than $2,500 in child support may be denied a passport.
Yes. The passport can be revoked or limited, if you owe a certain amount of unpaid child support.
Owing excess child support does not invalidate a passport. That doesn't mean you can't be prevented from the leaving the country.
Simply pay the arrears and then apply for the passport.