I believe the answer you're looking for is "The columbian exchange." Hope this helps.
A small direct democracy. I hope this helps.
Answer:
He was the chairman of the Student Nonviolent Coordinating Committee (SNCC) from 1963 to 1966. Lewis was one of the "Big Six" leaders of groups who organized the 1963 March on Washington. He fulfilled many key roles in the civil rights movement and its actions to end legalized racial segregation in the United States.
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