We've all heard the story of the "40 acres and a mule" promise to former slaves. It's a staple of black history lessons, and it's the name of Spike Lee's film company. The promise was the first systematic attempt to provide a form of reparations to newly freed slaves, and it was astonishingly radical for its time, proto-socialist in its implications. In fact, such a policy would be radical in any country today: the federal government's massive confiscation of private property -- some 400,000 acres -- formerly owned by Confederate land owners, and its methodical redistribution to former black slaves....