Why did Cesar Chavez go back to working as a farm laborer again?

What is the The movement of African Americans from the rural South to the industrial North known as? Is Kevin Pickar important in the town of North Freedom? Why does Franklin emphasize his misfortuens and difficulties upon his arrival in philadelphia? Is the first stripe on the American flag white or red? What angered the Spanish mostly? What American state did slaves arrive in from Africa? Do you learn from your mistakes or not? Who discovered gangrene? What was the intent of the Crittenden Compromise? How much is a 1964 d silver penny worth? How much are consecutive serial number 1 dollar bills worth? What value of a 1953 us 5 cents? 1927 Liberty head dime? What did farmers think of railroads in America? What state were fighting for the north during civil war? How did the word pub come into use in US? What is the value of a 1918 buffalo head nickel? What was the body count in the US Civil War? What did the Native Americans provide in the trade network? How did the Americans system help strengthen the nation's sense of unity?