Patricia Bayonne-Johnson holds a photo of her great-grandparents and their son. The retired science teacher discovered that some of her ancestors were sold by the Jesuits of the Maryland Province in 1838, to pay off Georgetown University's massive debt. Nick Otto/The Washington Post/Getty Images hide caption

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Nick Otto/The Washington Post/Getty Images

Harriet Tubman, pictured between 1860 and 1875. The woman who will soon become the first African-American to grace an American currency note self-funded many of her heroic raids to save slaves by cooking. H.B. Lindsley/Library of Congress via AP hide caption

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H.B. Lindsley/Library of Congress via AP

A group of students calling themselves Reclaim Harvard Law School has been occupying a student center for weeks, demanding greater attention to racial issues, including more diversity among the faculty. Chiquita Paschal/Chiquita Paschal hide caption

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Chiquita Paschal/Chiquita Paschal

History Of Slavery, Future Of Diversity Still At Issue At Harvard

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Oxford University Press

When Ancestry Search Led To Escaped Slave: 'All I Could Do Was Weep'

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A photo from 1875 in Rio de Janeiro shows women street sellers called "quitandeiras," also known as "slaves who earn." A portion of the profits was returned to their masters. Marc Ferrez/Moreira Salles Institute hide caption

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Marc Ferrez/Moreira Salles Institute

Brazil Enslaved

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An aerial view of Monticello shows Mulberry Row to the right of Thomas Jefferson's house. Robert Llewellyn/© Thomas Jefferson Foundation at Monticello hide caption

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Robert Llewellyn/© Thomas Jefferson Foundation at Monticello

Thai and Burmese fishing boat workers sit inside a cell at the compound of a fishing company in Benjina, Indonesia on Nov. 22, 2014. The imprisoned men were considered slaves who might run away. Dita Alangkara/AP hide caption

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Dita Alangkara/AP

Interior view of a room with a rotunda ceiling during an auction of slaves, artwork and goods. William Henry Brooke, 1772-1860/Courtesy of The Historic New Orleans Collection hide caption

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William Henry Brooke, 1772-1860/Courtesy of The Historic New Orleans Collection

Remembering New Orleans' Overlooked Ties To Slavery

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In 'Escaping ISIS,' An Underground Railroad Forms To Save Yazidi Women

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Coates with his son Samori. Random House hide caption

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Random House

Ta-Nehisi Coates Looks At The Physical Toll Of Being Black In America

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An African-American Army cook at work in City Point, Va., sometime between 1860 and 1865. Food played a critical role in determining the outcome of the Civil War. Library of Congress hide caption

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Library of Congress

Underwater archaeology researchers explore the site of the São José slave ship wreck near the Cape of Good Hope in South Africa. Susanna Pershern/Courtesy of U.S. National Parks Service hide caption

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Susanna Pershern/Courtesy of U.S. National Parks Service

The new African Burying Ground Memorial Park was dedicated on Saturday in Portsmouth, N.H. Emily Corwin/NHPR hide caption

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Emily Corwin/NHPR

In New England, Recognizing A Little-Known History Of Slavery

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Whitney Plantation owner John Cummings has commissioned stark artwork for the site, including realistic statues of slave children found throughout the museum. Debbie Elliott/NPR hide caption

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Debbie Elliott/NPR

New Museum Depicts 'The Life Of A Slave From Cradle To The Tomb'

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Burmese migrant Thazin Mon Htay and her father Ko Ngwe Htay were trafficked to Thailand to peel shrimp. They worked 16-hour shifts, seven days a week, for less than $10 a day, Ko Ngwe told PBS NewsHour. Jason Motlagh/Pulitzer Center on Crisis Reporting for NPR hide caption

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Jason Motlagh/Pulitzer Center on Crisis Reporting for NPR

Great Dismal Swamp, in Virginia and North Carolina, was once thought to be haunted. For generations of escaped slaves, says archaeologist Dan Sayers, the swamp was a haven. U.S. Fish and Wildlife Service hide caption

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U.S. Fish and Wildlife Service

Fleeing To Dismal Swamp, Slaves And Outcasts Found Freedom

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Louis E. Pratt, master ivory cutter for Pratt, Read & Co., shows off eight ivory tusks, April 1, 1955. Courtesy of Deep River Historical Society hide caption

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Courtesy of Deep River Historical Society

Elephant Slaughter, African Slavery And America's Pianos

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A pedestrian walks along Lambeth Road in south London on Friday. Police have rescued three women from a home in the neighborhood. They were held hostage for some 30 years, according to authorities. Andy Rain/EPA/Landov hide caption

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Andy Rain/EPA/Landov