Henry David Thoreau wrote "Civil Disobedience" in 1848 advocating for citizens to oppose unjust laws and policies through non-violent civil disobedience. Specifically, Thoreau refused to pay a poll tax that supported the Mexican-American War and slavery, seeing both as immoral, and was subsequently jailed. In the essay, he argues that individuals should disobey and break unjust laws in order to follow their moral conscience over mechanically serving the state. Further, Thoreau believes civil disobedience is justified and necessary to enact positive change when a government acts immorally and suppresses justice and truth.