History is not always a pleasant thing, especially the history of the United States. History is not always full of convenient facts. One of those inconvenient facts is that when Columbus discovered America, it was already discovered by another group of individuals. Of course, another incovenient fact is that Columbus didn't actually discover America (if we are taking the European view). However, given that it was already settled by one group and another group was looking to settle it, there was bound to be warfare.