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Cesar was born in Arizona in 1927. His grandparents had come to the United States from Mexico years before. Cesar and his family lived on their farm. In the 1930s, there was very little rain in Arizona. The land dried up and farmers couldn't grow crops. Cesar's family had to move. They went west to California.
California had a lot of farmland. Cesar's family got jobs as migrant farm workers. That meant they moved from farm to farm to pick crops. It was hard work, and the pay was very low. Cesar worked in the fields to help his family. He also went to school. He liked to learn, but he didn't like going to school.Some children made fun of him because he did not speak English well.
When Cesar was 17, he joined the navy. He was at sea for two years. After he returned home, he married his true love, Helen. They later had eight children. Cesar returned to working in the fields. But he was angry about how hard life was for the farm workers. The landowners (土地拥有者) made all the money. They didn't treat the workers well. Cesar had always been quiet and shy. But now he decided it was time to speak up. He was going to work for farm workers' rights. He began by talking to farm workers.He helped them vote (投票). If they voted, they could help choose America's leaders. Cesar also got thousands of farm workers to join workers' organizations or groups.

What did Cesar help farm workers do?