One of the ways in which the Apollo 11 flight plan could be seen as a historical document is if it is used as some kind of primary source. Technically, any document written in the past is a historical document.
While there was much buildup pre-World War I, it is commonly understood that the assassination of Archduke Franz Ferdinand on 28 June 1914 in Sarajevo pushed the world to war as a result of a complex web of treaties and diplomatic obligations that quickly were triggered and resulted in sides being chosen.
What four beliefs..? nothing here
Answer: Because they would have less manpower
Explanation: