Went to the house of Deloris Jurete and ceasar chavez's brother. I asked her where the phrase " Si Se Puede" came from. She said back in the day they were in Arizona at some farm workers protest. They were talking about what they were going to do and everyone would say you can't do that here in Arizona, no se puede. and she would say, Yes we can " si se puede" and that's where the saying came from .