2 What were the causes and effects of the Crusades?

Beginning in Eurasia two early innovations had a huge impact on agricultural societies. They allowed people to produce surplus food and in turn populations grew in size. What were the two innovations? What happened to trade literacy art etc after the fall of Rome? What are some of the names for medieval markets? What happened to the western countiies of Virginia as a result of secession? What is the history of voice acting? What civilization attacked and plundered the city of troy and provided the dim cultural memory of which of the Homeric poems were based? Name of the longest canal in the western hemisphere? What tense is the verb began? What is the final word to all roads lead to? Where did the name havlik come from? What are Two reasons that led to the Age of Exploration? What does Ars Tribunus Angusticlavius mean? What is the first mountain range west to the great plains? What is the Origin of keep you posted? Did chivalrous knights really exist? What are the differences between 19th and 20th century cinema? How did hammaurabis code differ from earlier sumerian laws? What is the difference between a long discussion and a prolonged discussion? European interest in Persia? Why did the crusades result in cultural diffusion?