King’s letter from jail was a love letter in the broadest sense: it spoke of the need to be “extremists for love.” It was a letter of thanks to God and the Black church: “I am grateful to God that, through the Negro church, the dimension of nonviolence entered our struggle.” It offered a metaphor: It said America was a prison for Black people. “Injustice anywhere is a threat to justice everywhere,” he wrote. It proffered patriotism: Those protesters who “sat down at lunch counters … were in reality standing up for the best in the American dream” and “bringing our nation back to those great
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