On New Year's Day 2011, I flew to Lagos to research human trafficking in Nigeria. Towards the end of my trip, I visited a small town called Badagry, about a two-hour drive west of Lagos. In 1502, Portuguese colonists built one of the first slave-trading posts along the coast of West Africa in this city. The non-descript, two-story building still stands today as a museum, but for more than 300 years, it was one of the most active slave-trading outposts in West Africa. Estimates are that almost 600,000 West Africans were shipped from Badagry to the Americas to be agricultural slaves. That figure represents approximately one in twenty of all slaves transported from West Africa to the Americas during the entire time of the North Atlantic Slave Trade.