Caesar Augustus revivied Romes strength and wealth and created the position of emperor making Rome officially an empire. Julius Caesar's adopted son made emperors after the Republic more despotic. Rome however still experienced peace through what is called the pax Romana or roman peace. Its economic and military increased. For 200 years the empire remained great vigor amd began military expanison.
I am not completely sure but would it be answer number 4? Sorry if I am wrong, it just makes more since to me.
No, Even if the United States had wanted to enter the war, its military force was not ready for war.
Improved the welfare of a society through appropriate social, political, and economic conditions