What dangers does Samuel Thurston say people would experience when traveling to California but not when traveling to Oregon?

Samuel Thurston highlights that travelers to California would face greater dangers from the climate and geographical conditions, including harsher weather and the risk of encountering hostile Native American populations. In contrast, he suggests that the journey to Oregon is relatively safer due to its more temperate climate and greater availability of resources, which reduces the likelihood of encountering severe hardship. Additionally, the established settlements in Oregon provide a more secure environment for travelers.