During the Bear Flag Revolt, from June to July 1846, a small group of American settlers in California rebelled against the Mexican government and proclaimed California an independent republic. The republic was short-lived because soon after the Bear Flag was raised, the U.S. military began occupying California, which went on to join the union in 1850. The Bear Flag became the official state flag in 1911.

Bear Flag Revolt: Background

The political situation in California was tense in 1846. Though controlled by Mexico, California was home to a growing population of American settlers. Mexican leaders worried that many of these settlers were not truly interested in becoming Mexican subjects and would soon push for annexation of California to the United States. For their part, the Americans distrusted their Mexican leaders. When rumors of an impending war between the United States and Mexico reached California, many Americans feared the Mexicans might make a preemptive attack to forestall rebellion.

Did you know? John C. Fremont became one of California’s first two U.S. senators in 1850. In 1856, he was the Republican Party’s first-ever presidential candidate, but lost the election to Democrat James Buchanan. Fremont later was the territorial governor of Arizona.

In the spring of 1846, the American army officer and explorer John C. Fremont (1813-90) arrived at Sutter’s Fort (near modern-day Sacramento) with a small corps of soldiers. Whether or not Fremont had been specifically ordered to encourage an American rebellion is unclear. Ostensibly, he and his men were in the area strictly for the purposes of making a scientific survey. However, the brash young officer began to persuade a motley mix of American settlers and adventurers to form militias and prepare for a rebellion against Mexico.

Bear Flag Revolt: June-July 1846

Emboldened by Fremont’s encouragement, on June 14, 1846, a party of more than 30 Americans under the leadership of William Ide (1796-1852) and Ezekiel Merritt invaded the largely defenseless Mexican outpost of Sonoma just north of San Francisco. Fremont and his soldiers did not participate, though he had given his tacit approval of the attack. Merritt and his men surrounded the home of the retired Mexican general Mariano Vallejo (1807-90) and informed him that he was a prisoner of war. Vallejo, who was actually a supporter of American annexation, was more puzzled than alarmed by the rebels. He invited Merritt and a few of the other men into his home to discuss the situation over drinks. After several hours passed, Ide went in and spoiled what had turned into pleasant chat by arresting Vallejo and his family.

Having won a bloodless victory at Sonoma, Ide and Merritt then proceeded to declare California an independent republic. With a cotton sheet and some red paint, they constructed a makeshift flag with a crude drawing of a grizzly bear, a lone red star (a reference to the earlier Lone Star Republic of Texas) and the words “California Republic” at the bottom. From then on, the independence movement was known as the Bear Flag Revolt.

After the rebels won a few minor skirmishes with Mexican forces, Fremont officially took command of the so-called Bear Flaggers and occupied the unguarded presidio of San Francisco on July 1. Six days later, Fremont learned that American forces under Commodore John D. Sloat (1781-1867) had taken Monterey without a fight and officially raised the American flag over California. (The United States had declared war against Mexico on May 13, 1846. This news apparently had not reached the Bear Flaggers at the time of their revolt.) Since the ultimate goal of the Bear Flaggers was to make California part of the United States, they now saw little reason to preserve their “government.” Three weeks after it had been proclaimed, the California Republic quietly faded away.

In 1850, California joined the Union. In the end, the Bear Flag itself proved far more enduring than the republic it represented: It was officially adopted as California’s state flag in 1911.

READ MORE: When California (Briefly) Became Its Own Nation