Ow did the four voyages of Christopher Columbus change our perception of geogaphy and alter world economics

The voyages of Christopher Columbus across the Atlantic Ocean were the beginning of what would become an extensive effort by Europeans to explore and colonize the Western Hemisphere. In this essay, compare and contrast the world view Europeans would have had before Columbus voyages and afterwards. Do the same for the economics of the Western world. Essay must have a bibliography listing all references utilized. Internet resources, if used, should be cited in similar format to that used for printed resources.