Union Oil, also known as Union Oil Company of California, was founded in 1890 and became a major player in the oil industry. The company was involved in the exploration, production, and distribution of petroleum products. It played a significant role in the development of the oil industry in the western United States, particularly in California. In 2001, Union Oil was acquired by Chevron Corporation, one of the largest oil companies in the world. This acquisition allowed Chevron to expand its operations and resources, further solidifying its position in the global energy market. Union Oil's legacy continues through Chevron's ongoing activities in oil and gas production.