By C. S. Manegold

ALMOST HALF a century ago, Martin Luther King Jr. captured a problem that still plagues us today. Cautioning his flock against the complacent embrace of incomplete knowledge, he warned: “Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.’’

I have thought of those words often in the last few years as I worked to unearth the history of a century and a half of slavery on a Massachusetts farm first owned by the famous Puritan, Governor John Winthrop, whose “Model of Christian Charity’’ is often quoted even now.

In the several times I have presented these unpleasant truths in talks at major universities, I have inquired afterwards – who knew this history of slavery in the North? Usually only about three hands go up of 30. And most of these people are professors. Among non-professors the void is even deeper. Students, stumbling on this news, tend to ask with some aggression: “Why didn’t they teach us this?’’ Why didn’t I know?

I am older, and I grew up in a different time, but I said these words myself not long ago. Now that I know better, I realize there are many answers to the question. But the best perhaps are these: Easier not to. More comfortable not to.

Yet as King suggested, responsible dialogue can not move forward with half-truths and willful ignorance. In this regard, the North has work to do. It lags behind the South in stepping up to ugly truths.

C. S. Manegold, author of Ten Hills Farm: The Forgotten History of Slavery in the North, was a reporter for The New York Times, Newsweek and the Philadelphia Inquirer before turning her attention to longer works. For more information about slavery in the North visit tenhillsfarm.com. See also Manegold’s Boston Globe piece: New England’s scarlet “S” for Slavery.

IMAGE: The Royall House and slave quarters