What was the problem in the Crusades?

What event has been an important cause of the surge of immigration to European countries since the beginning of the 1990s? What was the crusades about? What is the emperor's champion's stats? What was the roman merchant ship made out of? What caused Macedonia to become a powerful and successful empire? What were some of the advantages and disadvantages of the time limits on Roman government service? What does this word civilizations means? What city fell to the Trojan horse? The Crusades revived European business and trade? What is the difference between a chancellor and an emperor? What does Kriston mean? As a result of the Crusades the use of money? What was a major European power during the eighteenth century? Can peasants in the medieval times wear shorts? Who united the Roman empire moved the capital from Rome to Byzantium and he stopped the persecution of Christians? The roman general varus lost to the Germans in which forest? Why was the art music of the middle ages predominantly religious? How did emperor Nero make an impact on the roman empire? Why crusaders could not keep control of their conquests? What empire names existd before and there ruling place?