What European development played the greatest role in permitting Europeans to imperialize Africa?

Military power.

Explanation:

Military power is the development played the greatest role in permitting Europeans to imperialize Africa because the Europeans has high military power as well as latest weapons which help them to rule over the African countries. African countries lack the modern weapons which cost them a lot when they fought war against the Europeans so the military power and latest weapon helps them to imperialize Africa.

500 books can be produced by one man and a printing press within 5 months, while a copyist can only produce one in the same amount of time

explanation:

7 - to develop an asian ally

11- the red scare

14   the power of military -industrial complex

17 - the economy grew quickly

24 - the separation of church and state was not important