The answer is: During the 21 hours that the president's body was laying in state in the Capitol Rotunda, about 250,000 people filed by to pay their respects.
President Kennedy was really popular among united states' citizens and really influential in foreign relations.
The killer of president Kennedy at that time was an ex-marine. He was influenced/indoctrinated by the soviet union and ordered to take Kennedy's life.
around 250,000 people went to the capitol of rotunda when Kennedy was murdered, and millions of Americans watched the burials on live tv.