By the late 1820s, American ships had begun to arrive in California seeking especially to acquire:

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By the late 1820s, American ships had started arriving in California seeking cow hides and tallow, which were in high demand in the eastern United States. The hides were desired for their use in making leather goods, while tallow, a fatty substance obtained from animal tissue, was used to make candles and soap. This trade helped to stimulate the Californian economy and also introduced new technologies and methods for managing herds of cattle.

By the Late 1820s, American Ships Had Begun to Arrive