American History
R_Escobar (20th century, American Indian), crazedandinfused (antebellum, intellectual), hopin'-n-prayin' (southern, religious), stevemcn (transnational), Simple Twist of Fate (early American)
European History
Kelkel, goldielocks (Britain), SapperDaddy (Eastern and Central Europe)
African History
Oseirus, Singwaya18, Safferz
Latin American History
teachgrad (20th century, Southern Cone), BH-history
East Asian History
alleykat
Near/Middle Eastern History
uhohlemonster
Atlantic World
sandyvanb
Jewish History
uhohlemonster, hopin'-n-'prayin
Others???