Commemorating Historic Cemeteries: There are "union cemeteries" all across the United States, and most have nothing to do with Union troops of the Civil War. So, why is the name Union applied to so many burial grounds? Perhaps to set them apart from the sectarian cemeteries that were run by (and often adjacent to) churches. Methodist, Presbyterian, Baptist: all could be buried in a union cemetery. Some folk, however, may not have been welcome, and that is the type of information never mentioned on historical markers. Union Cemetery.