How long have pilgrims been around for?

Why did the Europeans feel it duty and right to civilize the Africans? What European country did Muslims take over? When was Velvet Empire created? Which civilization started the caste system? How did war lead to economic growth for ancient Rome? Why was the crusades so historically important? What contributed to a culture development? When was the first wheel used? Where did the steam engine start and where did it end? What Groups that ruled kiev and the surroundings are in chronoligical order? What did the Romans think about what is in space? What did the townspeople demand of their local lords? Why christian involved in crusade in 1000 years ago? How where the west African kingdoms involved in the slave trade? Why did the byzantines distrust western christians after the crusades? Why might people accept mongol rule? Which country was divided between east and west? What can you conclude from the fact that Constantine I moved the capital of the Roman Empire from Rome to Byzantium? What are the ideas that the Middle Ages were rooted in? What architectural element did the Romans use extensively?