A challenge about women and marriage in Islam

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Girls should not be forced into marriage simply because their bodies are capable of becoming pregnant.

As I told before, forcing marriage is not allowed in Islam

In most US states they allowed below age marriage if the girl is pregnant
I think it is much better to regulate marriage before pregnancy (i.e. the Islamic system)

Emancipation. For a child (or teenager) to be emancipated from their parents they have to pass a bar or two. 1: Go to court and sue their parents for legal emancipation. 2: Join the armed forces. 3: Have a kid, though I believe this is only in the case of females, I might be wrong and this might apply to the males as well.
Any way you cut it, I don't think there's a court in America that would emancipate a 9 year old, mother or not. You see, regardless of whether or not the sex was consensual, the US legal system clearly states that a 9 year old is incapable of consenting to sex. Therefore, the father would be arrested for, at the very least, statutory rape. Unless the father is also 9, in which case the legal system would look at the parents and child protective services would become involved.
Teens can get married here so long as the parent's give their consent (this is another way one can become legally emancipated from one's parents, through getting married). However, the states have a minimum age set before his/her parents can even consent to a legal marriage. Generally around 15 or 16, depending on the state.
How can a 9 year old consent to marriage if they legally cannot consent to sex? 9 year olds should not be viewed as brides or sexual objects. Because they are children. Even if they've reached puberty, they are still children.