World History - What were the causes of the fall of Rome

World History

You are required to respond to the assignment questions posted above with no less than 200 words. To support your response you are required to provide at least one supporting reference with proper citation.
Answer all questions in apa format with each question more than 200 words. 

1- What were the causes of the fall of Rome?  Do you think any one reason stands out as decisive?  If so, which one, and why?

2- What were the influences of Imperial China on culture and civilization in Vietnam, Korea, and Japan?

3- Compare and contrast the socities and cultures of Imperial China and Imperial Rome.  How were they similar?  How were they different?

4- What were the social, cultural, religious, and economic characteristics of the Aryan Civilization in India?  How did the Aryans alter ancient Indian civilization?