The concept of cause and effect is “common to multiple disciplines as well as central to the social studies” (Social Studies, 2012, par. ... In historical terms, every event has a cause, and is itself the cause of subsequent events, which may therefore be considered its effects, or consequences”
While it is difficult to determine exactly how many Natives lived in North America before Columbus, estimates range from a low of 2.1 million to 7 million people to a high of 18 million.
