Is this an apropriate history thesis?

I'd condense that paragraph to a sentence and save the details for later on. Your main point seems to be in contrasting the 'youth in revolt' and carefree attitude of the younger generation with the grim and serious problems affecting the world at large. Don't mention so many specific examples in the thesis statement (Jimi Hendrix, civil rights movement, free love; all important concepts but you'll have more room to fully explore them later). Condense the thesis to a single sentence which states the topic concisely (that there is a large difference in the youth/popular culture of the 60s and America's much more serious national issues.)