 Complete the following phrase:  The first non-Native Americans to pass through the area of Castle Lake were hunters and trappers of the Hudsons Bay Company, who began to come down the Siskiyou Trail from present-day Washington into Mexican-controlled California, in the late 1820s and early 1830s, in search of beaver and other pelt-bearing animals. At about this same time, Ewing Young led the first group of Americans up the Siskiyou Trail, passing near Castle Lake. In 1841, an overland party of the 