A sign commemorating the arrival of the first Africans is displayed at Chesapeake Bay, in Hampton, Va., August 24, 2019. (Michael A. McCoy/Reuters) It didn’t begin or end in the United States. The same people most obsessed with slavery seem to have little interest in the full scope of its history. There has been an effort for decades now — although with new momentum lately, as exemplified by the New York Times’ 1619 project — to identify the United States and its founding with slavery. To the extent that this campaign excavates uncomfortable truths about our history and underlines...