What is the theme in Beat Movement by ?

Disillusionment is a major theme. At the end of World War II, Americans enjoyed a period of blissful relief and charged-up happiness unlike any realized before. Although an odd mixture of pride and sorrow over the dropping of atomic bombs left many people uneasy about the path to victory, it did not waylay the renewed spirit of optimism and drive for prosperity that swept the country at a feverish pace. The latter part of the 1940s and most of the 1950s have been called times of innocent fun, social quietude, and old-fashioned family values.