Prediction of Of Mice and Men

I think Of Mice and Men is basically about farmers and poor workers' life. The story happened in California. The two main characters are migrant field workers. They did not have a stable life. They were too poor to get enough food and places to live. They were not able to feed their families. They were trying to get jobs in the city. However, it was so hard to get a job. Life in California in the 1930's was really rough and boring. It should be a really sad story, and it did not have a good ending. It is a novella which related to people's real life style in 1930's.