Mentioning previous answers is not intended to discourage further discussion. Any follow-on questions, information, or debate is welcome.

"How chaotic was the collapse of the Austrian-Hungarian Empire?": in https://www.reddit.com/r/AskHistorians/comments/7xu208/how_chaotic_was_the_collapse_of_the/dudyp7t/ /u/commiespaceinvader provided information about some of the chaos and violence in the years after the breakup.

"How exactly did the breakup of Austria-Hungary happen, who decided which nationalities would receive their own country, and how were their respective government forms decided upon?": /u/alcoran wrote a few paragraphs under https://www.reddit.com/r/AskHistorians/comments/7wjkkd/how_exactly_did_the_breakup_of_austriahungary/du1xgv6/ .

They ended with "I hope that gives you an insight in the complexity of the problems all the parts of the former Habsburg empire had to face after the breakup. To answer all your questions in depth would need some days.". In the discussion above, commiespaceinvader also provided a bibliography; half the sources are in English, half in German.

"AMA: The Age of Right Wing Revolutions, 1918-1945" at https://www.reddit.com/r/AskHistorians/comments/4yp32i/ama_the_age_of_right_wing_revolutions_19181945/ Commiespaceinvader is the only one who touches on some ex-Austria-Hungary territory and parts adjacent.