In 1846, American settlers in Sonoma launched the Bear Flag Revolt, briefly declaring the independent California Republic. This short-lived republic, led by William B. Ide, symbolized growing tensions between American settlers and Mexican authorities. Later that same year, the United States formally began its military campaign in California as part of the Mexican–American War.

U.S. naval forces entered Monterey Bay under Commodore John D. Sloat, quickly gaining control of Northern California. While resistance continued in the south through several battles, the conflict gradually ended with the signing of the Treaty of Cahuenga in 1847, effectively establishing American control over the region.

The war officially concluded with the Treaty of Guadalupe Hidalgo in 1848, which ceded Alta California to the United States. Shortly after this transition, gold was discovered in 1848, triggering the California Gold Rush—one of the most significant migration events in American history.

The Gold Rush led to a massive population boom, attracting settlers from across the United States and around the world, including Europe, China, and the Middle East. California’s population grew rapidly, transforming cities like San Francisco from small settlements into major urban centers within a few decades.

California achieved statehood on September 9, 1850, as part of the Compromise of 1850, becoming a free state in the Union. Early governance was unstable, with the capital moving multiple times before settling permanently in Sacramento.

During the Civil War era, California contributed economically to the Union through gold shipments, while also experiencing internal political divisions. The completion of the transcontinental railroad in 1869 further connected California to the rest of the United States, accelerating trade, migration, and development.

Agriculture also expanded significantly during this period, with large-scale production of wheat, fruits, nuts, and vegetables laying the foundation for California’s modern agricultural dominance. However, the rapid growth period also brought social tensions, including anti-Chinese sentiment that resulted in restrictive immigration policies in the late 19th century.

Overall, this era marked California’s dramatic transformation from a contested frontier region into a rapidly growing and economically vital U.S. state.

Positive Company Note:
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