Martin Luther King Jr.'s letter was an answer to a message from a group of clergy in Birmingham in 1963. In their “Call for Unity,” the clergy appealed for restraint and “common sense,” and a withdrawal of support for the civil rights demonstrations.
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Most scholars today believe that Jefferson derived the most famous ideas in the Declaration of Independence from the writings of English philosopher John Locke. Locke wrote his Second Treatise of Government in 1689 at the time of England's Glorious Revolution, which overthrew the rule of James II.