With the same type of optimism presented in 1939's All's Fair at the Fair this 1965 film of the World's Fair in New York gives the impression that people can come together and bask in the beauty of our ever-improving world. The sincerity of the narrator is incredible, "A suspended theater with a film on the joy of living!"
The second half of the film provides a great look at the General Motors Futurama II exhibit. This, along with the cheeky narrative told through the eyes of lost boy scouts and hormonal teenagers is pure paleo-future fun.
(The YouTube video above has both parts compiled into one film but if you'd like the source video you can find them at the Internet Archive in two parts here and here.)