What did Cesar Chavez do to advance the rights of migrant farm workers? a. he encouraged all migrant farmers to leave US
b. he set up a union and promoted boycotts of farm products to push for farm workers rights
c. he destroyed farms to show the farm owners the workers were serious
d. he started his own farms with only migrant workers

b) he set up a union and promoted boycotts of farm products to push for farm workers rights

Explanation: The formation of the United Farm Workers (UFW) in 1965, under the leadership of Cesar Chavez, redefined farm labor activism and contributed to a new era of social justice movements in the United States. The union developed after years of struggle and failed attempts to create a permanent union for farm workers.

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