W.J. Morgan & Co., Westward the Course of Empire Takes its Way, n.d.; chromolithograph; courtesy the Bancroft Library, U.C. Berkeley.

A large group of emigrants halt on mountain pass to observe valley below.

The First American Pioneers

The first group of American emigrants to reach California by land was the Bidwell-Bartleson party, which arrived in 1841. The trail they blazed as they moved west was known as the California Trail, and became the main path traveled by tens of thousands of emigrants who followed.

The Mexican political leaders of California were never at ease with the few thousand U.S. citizens who settled in their territory. They wanted them to become citizens of Mexico and they tried to bring the settlers into Mexican society and culture. The new emigrants, however, were by and large not interested in adapting to the ways of the Californios (people of Spanish and Mexican heritage who lived in California). Soon the number of U.S. settlers was so great that the Californios were no longer able to maintain control of the region.



Tensions Among U.S. Emigrants and Californios – the Bear Flag Republic and California as a U.S. Territory

In California, tensions between the new U.S settlers and the Mexican political leaders soon reached a boiling point. In 1846 a small band of settlers (mostly of them non-Mexicans) declared California a new republic, independent of both Mexico and the United States. They were known as the Bear Flag Republic rebels.

The rebels did not know that the United States had already declared war on Mexico a month earlier. The largely Anglo-American Bear Flag rebels imprisoned Californio leaders, including General Vallejo, in their attempt to gain control of California. This happened in late June. Independent Californio fighters in Southern California, meanwhile, resisted U.S. forces until January 1847. In that month they surrendered, and California came under the control of the United States. A year later, with the signing of the Treaty of Guadalupe Hildalgo, the Mexican-American war ended and much of the American Southwest was ceded to the United States.

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