Because Pax Romana was a period of peace. Also Alexander the Great was a Christian supporter so he didn't want to go against Christianity. (Alexander the great brought pax romana)
Socialism is a political and economic theory of social organization that advocates that the means of production, distribution, and exchange should be owned or regulated by the community as a whole, communism is a political theory derived from Karl Marx, advocating class war and leading to a society in which all property is publicly owned and each person works and is paid according to their abilities and needs and capitalism is an economic and political system in which a country's trade and industry are controlled by private owners for profit, rather than by the state.
They are both about the Trojan War, Miss. Please message me, if I may help with any other questions!
The Nile river valley and the southern tip