Separation of Powers is the term described above.
The halting of Hitler's armies by Russia and their conquest of North Africa.
I believe that Nicola Sacco was convicted of murder in World War I.
Hope this helps!
~Mistermistyeyed.
Classical civilizations developed vast empires, whereas early river valley civilizations did not.
This was indeed the case because classical civilizations were considered to have created the cornerstone of today's society and were therefore instrumental in creating modern day life in a way.