He was a US President, he was assassinated by Lee Harvey Oswald. He had an affair with Marilyn Monroe (actually so did his brother, ewww). His assassination and secretary had a lot of similarity's with Abe Lincoln and his assassination and secretary. My favorite thing is though, that you can be him on Black Ops when you kill zombies. He says all kinds of funny stuff. Like, when he runs out of ammo he says,"Need more beans for the chowder here!". It's great.
I'm not really familiar any of his speeches but I do remember one quote from him was "ask not what your country can do for you, but what you can do for your country" and he is also famous for taking care of the Bay of Pigs, and the Cuban Missile Crisis. He was also, unfortunately, famous for being one of the few presidents shot while in office. Good luck!!