What events led to the decline of the Roman Empire? How did the Roman Empire differ from the Byzantine and Arab Empires (e.g., culture, religion, geography, government)?

What are the five major religions in the world? Describe their similarities and differences, including where they originated and overall beliefs.
How did feudalistic Japan and Europe differ? What were the similarities? Be sure to include information comparing the European knights and the Japanese samurai (e.g., chivalry versus bushido).

This is an open disscusion

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Most Important Causes of the Fall of the Roman Empire

Decline in values ​​and morals. Even during the Pax Romana (stable and relatively peaceful period), there were more than 30,000 prostitutes in Rome.
Public health and diseases. In the Roman Empire there were many environmental and public health problems.
Poor technological development. ...
Inflation. ...
Urban decay. ...
A divided empire. ...
Invasions of Barbarians. ...