Very well posted.
Back When as it were, when some mergers were made, sometimes there were competing GLOs therefore were not able to merge. I dont know if this is the case as it was with LXA and TKN.
And during WWII many Chapters died never to return again. Many Houses were taken over by the Govt. for living quarters as many were nice large houses.
I dont think Sororitys were as hard hit as Fraternitys with Men signing up for Militarty service, but times were tough and so was money.
Guess You had to be living then to understand!