One of the most important, yet most debatable, tasks that a historian must complete is weighing evidence after reviewing historical facts. Historians make decisions based on many different pieces of evidence. They decide how important each piece of evidence is to the way that history played out. This brings up the question of the extent to which the weighing of evidence by historians in relation to events in history is subjective or objective. The weighing of evidence tends to be subjective simply because of the often multiple different causes of certain events in history.This can be seen in the analysis of almost every historical event in recorded history, but especially in the analysis of the cause of World War II. Many different factors played into the cause of World War II. Between the economic sanctions imposed by countries such as the United States and Great Britain, political tension between the major powers, or expansionist foreign policies of Italy, Germany, and Japan, no single cause can be seen as the only one to start to war (History.com staff). However, deciding which cause had the greatest impact on war is what historians debate over and weigh evidence over, yet they often come to separate conclusions.