Tsarina Alexandra's biggest mistake after she took over the leadership of the Russian government while her husband Nicholas II was on a battlefield was putting too much trust and confidence to Rasputin's decisions which regard to running the country. People of Russia no longer trust the royal family since then. Hope this answer helps.
Because they were different from other city-states
I believe that is the correct answer
Answer:
C
Explanation:
It established rules of modern warfare
