A primary source of anything is a first hand account be it a diary, eye witness account, the person must have experienced it themselves while a secondary the information could have been passed on for example a news paper or memoir on someones life.
ANSWER: The war started mainly because of four aspects: Militarism, Alliances, Imperialism and Nationalism. This is because big armies become potential threats to other countries, other countries started forcing alliances in order to secure land. ... The overall cause of World War was the assassination of Archduke Franz Ferdinan
<span>President franklin d roosevelt referred to December 7, 1941 as "a date which will live in infamy" because on that day the Japanese bombed Pearl Harbor, which brought America into World War II. </span>