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:
1 and 4?
Explanation:
i can really see or understand too much of the question, but 1 and 4 seem right, keep waiting for another person to answer just in case.
