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

How much is a 1881 gold ten dollar coin worth? What was the first coast-to-coast highway across the US and was it a US or Interstate highway? What was true about president Kennedy victory in the 1960 presidential election? What are the ethnic groups that were left without nations after the nationalist movements of the nineteenth century? How did Frederick Douglass and Harriet Tubman fight against slavery? Ibang pang anekdota ni Jose rizal maliban sa tsinelas? What is the original name for the area that became the states of the Midwest? What is Ernest Everett Just famous for? Why did parliament pass the townshend act? What is the value of 1852 blue certificate dollar bill? What is the separation of Native Africans from the European Africans called? About how many African slaves were there in the colonies in 1775? Which abolitionist originally came from the south? What is the value of a 1832 Indian penny? What was the last year the 2 dollar bill was made? What were two ways that people resisted the fugitive slave act? Who smuggled alcoholic beverages into the US during prohibition? What are the contributions of late president Corazon Aquino to the Philippines? Walking liberty half dollar coin in not so good condition but there is a small S on the back of it how much could it be worth? Who were the civil war leaders?

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