Here's the real story behind Martin Luther King Jr.'s greatest moment

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But Martin Luther King Jr.'s crowning moment may never have happened without one of the largest protests ever - the March on Washington on August 28, 1963.

After growing backlash against blacks in the South, King and five others planned the event, a peaceful demonstration to end segregation and promote equal rights.

King crafted his famous speech specifically for the 250,000 people who would gather in the nation's capital that day.