The most revealing image of America’s 250th birthday celebration wasn’t the fireworks bursting over the National Mall, colonial reenactors in Boston, or the military flyovers that filled Washington, D.C.’s skies. It was a Reuters photo, shot by Cheney Orr, of a lone Black woman on public transportation.
Riding the Metro, Washington’s subway system, the as-yet-unidentified woman, in a green T-shirt,…