Oftentimes, a history book in school will talk about the Underground Railroad as if it's one sentence. But thousands of people decided to run, and they single-handedly changed the trajectory of our nation. By running to the North, they put a face to slavery, which recruited a lot of abolitionists.

It is with deep grief I watch the clattering down of the British Empire with all its glories and all the services it has rendered to mankind.

Before the Civil War, there were no national cemeteries, no processes for identifying the dead in the battle. There weren't any dog tags, and there was no next-of-kin notification. You didn't necessarily even hear what the fate of your loved ones had been. It was up to their comrades to write and inform you.

Well into the 20th century, black people spoke of their flight from Mississippi in much the same manner as their runagate ancestors had.

In short, Europe’s colonization of Africa had nothing to do with differences between European and African peoples themselves, as white racists assume. Rather, it was due to accidents of geography and biogeography—in particular, to the continents’ different areas, axes, and suites of wild plant and animal species. That is, the different historical trajectories of Africa and Europe stem ultimately from differences in real estate.

What distinguishes the historian from the collector of historical facts is generalization.