This August marked 400 years since the first documented enslaved Africans arrived in the U.S. In 1619, a ship reached the Jamestown settlement in the colony of Virginia, carrying “some 20 and odd Negroes” who were kidnapped from their villages in present-day Angola. The anniversary coincides with a controversial debate in the U.S. about whether the country owes reparations to the descendants of slaves as compensation for centuries of injustice and inequality. It is a moment for posing questions of historic guilt and responsibility.

But...