Why were the middle ages important to the rise of nation states and development of national economies?

A little help please





Thanks in advanceWhy were the middle ages important to the rise of nation states and development of national economies?
Becuase you know each year they got new invention new stuffs if you're teens you will able to learn that stuff in the 1700 they don't know how to drive a plan but we do know so think what is the changes?we become smatter becuz we know more skills about everything when we were teen in any year every year has a new things!So think about it!