ZD: There has not been alot of Torah written about running a government in a modern society, In fact almost none.
What was this in reference to?
The main reason the Poskim haven’t written extensively about running a modern government is probably because (a) it’s never been Nogea; there has never been anyone Frum (Read: Observant to Hashem and the Torah) in a governing position over Klal Yisroel; (b) Halacha may not permit running a modern day government.
Enough Torah has been written, however, about going to the Army.