Why is msopotamia called the country of civilization?

How many years separated the first and the fourth crusades? What is an advolution? What was the century in 900? What is the past tense of warp? What were the problems experienced by most of Rome's common people in the early days of the republic A A commoner who could not repay what he owed became a victim of debt bondage B Commoners? Who fought with the knights in the first crusade? Where did the last name Norman come from? What country does the surname Van Zyl come from? Is it wheel barrel or wheelbarrow? When did Medieval Mayhem happen? Who influenced the medieval scholasticism? What does the name Curtis mean? What led to the creation of the iron curtain? Griots contributed to west African societies by? What is the most populr last name? Was the crusade effective? What were the white league and knights of the camellia? Who the synonym of began? Where and when the calendar was made? What is the difference between coal mined in the appalachians and in the western states?