The document summarizes the history and experiences of Mexican Americans and Puerto Ricans in the United States. It discusses how the Treaty of Guadalupe Hidalgo established citizenship for Mexican Americans but they still faced loss of land and lack of legal protections. Large-scale Mexican immigration was driven by economic factors on both sides of the border. Puerto Ricans gained U.S. citizenship but have no voting representation and face economic struggles on the island. Both groups experience higher levels of poverty and unemployment compared to whites.