Yes, regardless of how they happened, they still happened, and they should affect the RP.
Look, I did a freaking report on the 1920s there was a lot of wars that started. (lasted like 5 months, but still) remember, GREAT DEPRESSION IN 9 BLOODY YEARS! (usa only got out of it bc of WW2)
you probably should add bank jobs.
also, who owns the Manor?
EDIT: LEAGUE OF NATIONS IS FORMED! WOMEN CAN VOTE! USA occupies several nations in the Caribbean.
also, how long does this RP go on? till '30? '39? '45?