Final answer:
Hundreds of thousands of Americans paid their respects to President Kennedy by attending his funeral procession and viewing his body lying in state at the Capitol Rotunda.
Step-by-step explanation:
When President Kennedy died, hundreds of thousands of Americans paid their respects in various ways. One major way was through attending Kennedy's funeral procession in Washington, D.C. Many lined the streets as the casket passed by, and some even walked along the procession route. Another way Americans showed their respect was through viewing Kennedy's body lying in state at the Capitol Rotunda. People waited in long lines to file past and pay their respects.