Dennis Kennedy, a history teacher at Bay View Academy Upper School in Johnston, R.I., recently participated in a conference conducted by the Committee on Teaching About the United Nations in New York City. He said the conference, on economic inequality and human trafficking, provided him with new insight into a unit he taught just prior to the trip -- Lincoln's struggle to end slavery through the passage of the 13th Amendment to the Constitution. "It was jarring to learn of the scope and scale of human trafficking in the world today -- which by some estimates, involves over 20 million victims," he said.

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