Why do historians analyze historical events and cause-and-effect relationships?

What person was influential and trying to ease race relations in america during the early part of the twentieth century

How did the atomic bomb end the war

Which of these was one of the most important aspects of washington's presidency a. he did not consider how his actions would affect later presidents b. he came to believe that political parties would be good for the country. c. he insisted that congress make specific rules about the duties of the president d. he did not take advantage of the opportunity to keep the power the country offered him.