The slavery crisis inflamed New England in the 1840s and 1850s. The environment became especially tense after the Fugitive Slave Act of 1850. A lifelong abolitionist, Thoreau delivered an impassioned speech which would later become Civil Disobedience in 1848, just months after leaving Walden Pond. The speech dealt with slavery and at the same time excoriated American imperialism, particularly the Mexican–American War.
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