Which explorer was known for his explorations that encouraged westward movement into California?

John C. Fremont is recognized for his explorations that significantly contributed to the westward expansion movement into California during the mid-19th century. His expeditions in the 1840s provided valuable maps and documentation, which sparked interest in the region for settlers and other explorers. Fremont’s reports highlighted California’s natural resources and potential for settlement, leading many to see it as an ideal location for new opportunities. His role in the Bear Flag Revolt and as a prominent figure in the U.S. military further solidified his influence in the region’s history.

In contrast, while Gaspar de Portolá was an important figure in the Spanish exploration of California, his explorations occurred earlier in the 18th century and were mainly focused on claiming California for Spain rather than promoting westward migration. Juan Rodríguez Cabrillo explored the California coast in the 16th century but did not have a direct impact on westward movement as his objectives were more about exploration and claiming territories for Spain. Kit Carson, although a notable frontiersman and explorer, is more recognized for his role in guiding expeditions rather than being a primary driver of the initial wave of settlers into California.