This thread has wandered way off topic but here is a link to something actually about US child brides.
For some statistics on the subject: http://www.unchainedatlast.org/child-marriage-shocking-statistics/ (the article links to it)
Florida now has a law against this, it was passed around 7 weeks after the article above was published due to the campaign reported on in that article.
I have a hard time viewing a teenager who is well into adolescence as a child.
Likely to be woefully unprepared for the wider world despite however street smart they think they are? Sure.
Being a "high risk" group for a large number of medical issues? Sure.
A Child? Nope. If anything, treating them as children is demeaning, and unnatural, and potentially detrimental to both them and many adults as well, for reasons that have been discussed previously.
That isn't to say they should be classified as adults, as they're not quite that either. This is a case where I'd like to smack around some (christian) moral crusaders from about 130 years ago around on more than a few items. Their solution, quite frankly, sucked.
But when it comes to dealing with the "and younger" set, certainly feel free to stick to the path they set.
When it comes to the older set however, there really, desperately needs to be another legal category, or two or three, created for them, and society needs to get that "child" nonsense out of its system.
If a future Multi-Billionaire can drop out of Junior High School in the 1930's, and begin a business enterprise involving chickens he subsequently turns into an agribusiness worth Billions over the course of 50-some odd years, obviously teenagers are capable of quite a lot. If they're allowed to do so.
The digital era likewise has its legions of teenage millionaires to point at. So it isn't like this is a fluke. They need guidance, and protection from predators and leeches alike. They don't need to be locked in a proverbial padded room with a condescending instruction to "wait until you're older."
The "child marriages" such as they are(or are not involving children), ARE predatory, and should be addressed. The complicating factor here is international law and whatever conventions the various nations involved may be party to. In which case, State Law is going to take a back seat to Federal Law/Treaty. Where practiced within the United States under legal restrictions, it either is with judicial oversight, parental involvement, and/or the "child" being at such an age they really should have a decent idea of what they're getting into.
Sorry, but I have a hard time freaking out over a 16YO getting married. Yes, there are many concerns with respect to someone that age being involved in a Marriage, but at the same time, its an issue that isn't likely to be easily addressed for a multitude of reasons. Chief among them being the (exploitative) "religious practice" aspect as it pertains to the US Constitution.
So on one hand I'd love to see action taken to curb it, but on the other hand, I have concerns about further implications beyond that. Particularly when it comes to other agendas that might be in play, now or in the future once the precedent is set. My preference in the 16YO Scenario is to empower the 16YO with options so they can extract themselves from the exploitative situation, if that is what it really is. Rather than impose a blanket ban on something simply because it makes people squeamish.