Mexicali (pronˌmɛksɪˈkæli; mexiˈkali) is the capital city of the Mexican state of Baja California. The city, seat of the Mexicali Municipality, has a population of 689,775, according to the 2010 census, while the Calexico–Mexicali metropolitan area is home to 1,000,000 inhabitants on both sides of the Mexico–United States border. Mexicali is a regional economic and cultural hub for the border region of The Californias. Mexicali was founded at the turn of the 20th century, when the region's agricultural economy experienced a period of boom. The city rapidly expanded throughout the 20th century, owing to the proliferation of maquiladoras in the city, making the Mexicali economy more interconnected with businesses from across the border. Today, Mexicali is a major manufacturing center and an emerging tourist destination. The Spaniards arrived in the area after crossing the Sonoran Desert's "Camino del Diablo" or Devil's Road. This led to the evangelization of the area by Catholic missionaries and also to the reduction of native populations in the region. Nowadays, indigenous Cocopah people still inhabit a small government-protected corner of the Colorado River delta near the junction of the Hardy and the Colorado. The Cocopah mostly work on agricultural ejidos or fishing. The early European presence in this area was limited to Anza's and subsequent Spanish expeditions across the Colorado Desert and subsequent travelers on the Sonora Road opened by them. Also the presence of the Jesuits who attempted to establish a mission in what is now Fort Yuma. They left after a revolt by the Yuma in 1781. After this, the Spanish had little to do with the northeastern corner of the Baja California Peninsula, perceiving it as an untamable, flood-prone desert delta. Later in the 1820s, the Mexican authorities reopened the Sonoran Road and restored peaceful relations with the Yuma People. In the mid-19th century, a geologist working for the Southern Pacific Railroad came to the delta area, discovering what the native Yumans had known for centuries: that the thick river sediment deposits made the area prime farming land.