Anybody who knows any US History or Alaska History knew that most to the construction troops on the AlCan were Black.   Unfortunately, almost nobody under about 40 knows anything about History of any sort.   There is a long history of Black troops in Alaska going back to the Gold Rush.   A significant proportion of US troops in The West during the "Indian Wars"  and the US occupation of Western military districts and territories before they became states were the remnants of the US Colored Troops of the Civil War, often called the Buffalo Soldiers.   By the time of the Alaska Gold Rush the USCT had been formally disbanded but there were still many segregated Black units with White officers, particularly in The West.   When the US staged troops to Haines/Skagway and other points in response to the Gold Rush many of them were Black.   The Park Service has lots of photos of these units in Skagway, but then not many living in ANC have ever been to Southeast Alaska either.