C. Nationalism convinced the people of Europe that their own nation could take on any military threat.
Egypt developed around the Nile River, while Mesopotamia developed between the Tigris and Euphrates rivers. ... Politically, both Egypt and Mesopotamia had a government with one main ruler, but Egypt had a centralized government with a pharaoh, while Mesopotamia had a decentralized government with a king.Oct 22, 2012
1. gulf of tonkin incident
2. truman doctrine
3.containment of communism
probably a little off but it'll lead you in the right direction.
(I was literally learning this a couple months ago and my memory is a little rusty)