Which mountain man was the first European to enter California by land?

Jedediah Smith is recognized as the first European to enter California by land due to his exploration activities in the early 19th century. In 1826, while on a fur trapping expedition, he crossed into California through the Sierra Nevada, making his way down into the San Joaquin Valley. This was a significant event in California's history because it marked one of the early encounters between European Americans and the land that would later become part of the United States.

Smith's journey provided vital information about the geography and natural resources of California, paving the way for future settlers and explorers. His expeditions contributed to the increasing interest in the California region, which would eventually lead to further exploration, migration, and the establishment of new communities. His role as a mountain man and explorer is an essential part of California's early history.