That's some hard work my guy
Expanded trade, regional empires, and increased global trade are all effects of which of "<span>b. the transition from river valley civilizations to classical civilization," since classical civilizations engaged in more far-reaching trade and cultural diffusion. </span>
Is one of your ?choices...separation of powers?
If so, I believe that is it!
Hope this helps!
Poisedon is the answer he didnt help