This story was produced in partnership with the Pulitzer Center. Haywood Joiner Sr. was wandering about Lee Street, the bustling artery abutting the Black district of Alexandria, Louisiana. It was Saturday, January 10, 1942, a little over a month after Pearl Harbor. Hundreds of Black soldiers like Joiner were strolling in and out of bars and nightclubs, all under the watchful gaze of members of the predominantly white military police. Then there was a spark. It’s not clear why, but a white MP moved to arrest a Black soldier in…