The document discusses the history of California from the Treaty of Guadalupe Hidalgo in 1848 to the Great Depression. It summarizes that the treaty ceded Mexican territory above the Rio Grande to the United States, including California, for $15 million. The discovery of gold in 1848 sparked the California Gold Rush and rapid population growth. During this period, about 1 in 9 men died on the journey to California seeking gold. Economic troubles during the Great Depression led many agricultural workers to flock to California, though wages dropped significantly.