Answer:
Martin Luther King Jr. wrote the Letter from Birmingham Jail to defend the use of nonviolent resistance.
Step-by-step explanation:
The Letter from Birmingham Jail is an open letter written by Martin Luther King Jr. in 1963. It's considered to be the most important document of the civil rights era. It invites people to fight for justice in a peaceful, nonviolent, manner, calling that their moral responsibility. According to King, people shouldn't wait for justice to come through the courts, but take things into their own hands. Otherwise, they may never defeat injustice.