This hugely influential work marked a turning point in US history and culture, arguing that the nation s expansion into the Great West was directly linked to its unique spirit: a rugged individualism forged at the juncture between civilization and wilderness, which for better or worse lies at the heart of American identity today. Throughout history, some books have changed the world. They have transformed the way we see ourselves and each other. They have inspired debate, dissent, war and revolution. They have enlightened, outraged, provoked and comforted. They have enriched lives and destroyed them. Now Penguin brings you the works of the great thinkers, pioneers, radicals and visionaries whose ideas shook civilization and helped make us who we are.