First of all... what period? because if you are talking about this time, I think it is becaise they want to feel powerful to be able to have more allied countries in any situation, they also do it because they want to control most of the world natural sources that other countries have.
Answer:
D) they convinced citizens to come to the assembly
Explanation:
trust me !
Europe and was victorious for more than two years by relying on a new military tactic called the "Blitzkrieg" (lightning war). Blitzkrieg tactics required the concentration of offensive weapons (such as tanks, planes, and artillery) along a narrow front.
Explanation:
1.)black sea,mediterranean Sea,Atlantic Ocean,and the indian ocean through the Suez canal.
2.)Constantine the Great
thats all i know