Child exploitation and prostitution

I was surprised to know that there are more than 200k children trafficked in united states.

The website says,

"Among children and teens living on the streets in the United States, involvement in commercial sex activity is a problem of epidemic proportion. Approximately 55% of street girls engage in formal prostitution. Estes Report, Executive Summary at 7. Of the girls engaged in formal prostitution, about 75% worked for a pimp. Id. Pimp-controlled commercial sexual exploitation of children is linked to escort and massage services, private dancing, drinking and photographic clubs, major sporting and recreational events, major cultural events, conventions, and tourist destinations. Id. About one-fifth of these children become entangled in nationally organized crime networks and are trafficked nationally. Id. at 8. They are transported around the United States by a variety of means – cars, buses, vans, trucks or planes, Id., and are often provided counterfeit identification to use in the event of arrest. Id. The average age at which girls first become victims of prostitution is 12-14. Estes Report at 92. It is not only the girls on the streets that are affected -- for boys and transgender youth, the average age of entry into prostitution is 11-13"