Climate change was the first thing that came to my mind for some reason
The major impact of technology on World War I was that it made the war much more difficult for the infantry soldiers who did most of the fighting. ... The machine gun and the tank were new technologies that influenced WW1 the most. The machine gun lengthened the war and forced it to become a trench war.
Hope this helped
Pax romana was a time of peace so the army was laid back at the time. the the crisis of the third century struck resulting in civil war, invasion, <span>plague and economic troubles. the empire nearly collasped from all of this.</span>
B economic wealth anyone please correct me if i’m wrong