The William Wilberforce law of 2008 was to go to 2011.
What happened in 2011? Was it renewed, flipped, stayed on books?
http://www.state.gov/j/tip/laws/113178.htm
An Act
To authorize appropriations for fiscal years 2008 through 2011 for the Trafficking Victims Protection Act of 2000, to enhance measures to combat trafficking in persons, and for other purposes.
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Central and South American children crossings were far lower until this year, I believe it was the DACA memo that started this ball rolling.
Maybe Karl Rove has the answer.