provide an overview of Kennedy’s administration in the context of the Cold War. Include a discussion of the Bay of Pigs, Cuban Missile Crisis, and Kennedy’s legacy in Vietnam

I'm not exactly sure what you mean by this, but towards the end of his speech he said something to the effect of wanting to see "all the little black boys and all the little black girls" holding hands with "all the little white boys and white girls." This part of the speech gave listeners gave something to imagine of what he wanted for the future. It placed an image into people's mind, so I guess this could be an answer to your question if it's asking what I think it's asking.