"We were in Arizona. We were organizing people in the community to come to support us. They had passed a law in Arizona that if you said, "boycott," you could go to prison for six months. And if you said "strike," you could go to prison. So we were trying to organize against that law. And I was speaking to a group of professionals in Arizona, to see if they could support us. And they said, "Oh, here in Arizona you can't do any of that. In Arizona no se puede — no you can't." And I said, "No, in Arizona sí se puede!" And when I went back to our meeting that we had every night there ... I gave that report to everybody and when I said, "Sí se puede," everybody started shouting, "Sí se puede! Sí se puede!" And so that became the slogan of our campaign in Arizona and now is the slogan for the immigrant rights movement, you know, on posters. We can do it. I can do it. Sí se puede."
January 1, 1970
https://en.wikiquote.org/wiki/Dolores_Huerta