Answer:
How did the event occur, why it occurred
Explanation:
Historians ask the basic questions such as who was involved, what was the cause of the event and where did the event occur. These are called historical questions or historical inquiry. The questions involve what, who and where about the event.
Such questions are complex as sometimes historians study about the interrelationship between two or more phenomenons. To answer various historical questions it is necessary to conduct research.
To push for expanded voting rights for African Americans
Robert S<span>. </span>McNamara<span>. Was the </span>secretary<span> of </span>defense<span> under Kennedy. He helped develop the flexible response policy. He was against the war in </span>Vietnam<span> and was removed from 1964 Congressional resolution that authorized President Johnson to commit </span>US troops<span> to south </span>vietnam<span> and fight </span>a<span> war against north </span>Vietnam<span>.</span>