soc.history.what-if - join
Alternate history.
Low activity, 1578 subscribers, Usenet

sci.military.naval - join
Navies of the world, past, present and future.
Low activity, 886 subscribers, Usenet

rec.aviation.military - join
Military aircraft of the past, present and future.
Low activity, 1151 subscribers, Usenet

alt.history.british - join
A newsgroup for British History
Low activity, 237 subscribers, Usenet

soc.history.medieval - join
The historic period of the middle ages.
Low activity, 723 subscribers, Usenet

soc.history.war.misc - join
History & events of wars in general.
Low activity, 250 subscribers, Usenet

soc.history.war.us-civil-war - join
Aspects of the U.S. Civil War. (Moderated)
Low activity, 230 subscribers, Usenet

soc.history.war.vietnam - join
The Vietnam War. (Moderated)
Low activity, 73 subscribers, Usenet

soc.history.war.us-revolution - join
American Revolution/international perspectives.
Low activity, 125 subscribers, Usenet

soc.history - join
Discussions of things historical.
Low activity, 326 subscribers, Usenet