Recorded history of land in the far western side of present-day Riverside County and north of the Santa Ana River begins in 1838, when Mexican Governor Juan Alvarado, of the Alta California territory, granted Rancho Jurupa (some 48 square miles) to Juan Bandini. The city of Eastvale now occupies approximately the westernmost one-quarter of former Rancho Jurupa land grant. The Mexican–American War between the United States and Mexico ended in 1848 with the Treaty of Guadalupe Hidalgo, by which Mexico ceded Alta California and much other Southwestern land to the US. Two years later, on September 9, 1850, California became a U.S. state.