The significance of Martin Luther King Jr.’s “Letter from Birmingham Jail” lies in its powerful defense of nonviolent protest against racial injustice. Written in 1963 while he was imprisoned, King addressed criticisms from white clergy who deemed his actions "unwise and untimely." The letter articulated the moral responsibility to resist unjust laws and emphasized the urgency of civil rights activism. King's eloquent argument highlighted the connection between justice and morality, inspiring generations to advocate for equality. The letter remains a pivotal document in the civil rights movement and a testament to the endurance of the fight against oppression.