What is civil disobedience and what did Thoreau dude that is an example of it?

Civil disobedience is the act of peacefully breaking a law or rule to protest against unjust or unfair government actions. Henry David Thoreau's refusal to pay taxes in protest against the Mexican-American War and slavery is an example of civil disobedience. Thoreau believed in the moral obligation of individuals to resist unjust laws through nonviolent protest.