For 2000 years jews did not control their own destiny and so exactly how to run a county according to the torah was not thought about
Now that it has become a reality in the more charedi societies it still isnt really studied (There are some Dati-Leumi places that do study this topic and try to come up with solutions) even such simplet things as Shabbos is alot more complicated on a modern county than it is in a place like Kiryat Joel where jews do not really control anything (Like the Utiltiies , Water, Fire, etc) and to quote the Bostoner Rebbe. He was glad he was not in control of the government. he wouldnt know what to do about such things like the Airport (You cant shut down an airport for 25 hours, even if you dont scheduale flights) Flights get delayed in home country and are late and land after shabbos begins and foreign airlines could care less about shabbos