of years. Unlike the settlers who would eventually make Sacramento their home, these Native Americans left little evidence of their existence. Their diet was dominated by acorns taken from the plentiful oak trees in the region and by fruits, bulbs, seeds, and roots gathered throughout the year. Spanish period In 1808, the Spanish explorer Gabriel Moraga encountered and named the Sacramento Valley and the Sacramento River. A Spanish writer with the Moraga expedition wrote: "Canopies of oaks and cottonwoods, many festooned with grapevines, overhung both sides of the blue current. Birds chattered in the trees and big fish darted through the pellucid depths. The air was like champagne, and (the Spaniards) drank deep of it, drank in the beauty around them. "¡Es como el sagrado sacramento! (It's like the Blessed Sacrament.)" The valley and the river were then christened after the "Most Holy Sacrament of the Body and Blood of Christ," referring to the Catholic sacrament of the Eucharist. Mexican period John Sutter, Sr. first arrived in the area on August 13, 1839, at the divergence of the American and Sacramento Rivers with a Mexican land grant of . The next year, his party and he established Sutter's Fort, a massive adobe structure with walls high and thick. Representing Mexico, Sutter Sr. called his colony New Helvetia, a Swiss-inspired name, and was the political authority and dispenser of justice in the new settlement. Soon, the colony began to grow as more and more pioneers headed west. Within just a few short years, Sutter Sr. had become a grand success, owning a orchard and a herd of 13,000 cattle. Fort Sutter became a regular stop for the increasing number of immigrants coming through the valley. In 1847, Sutter Sr. received 2,000 fruit trees, which started the agriculture industry in the Sacramento Valley. Later that year, Sutter Sr. hired James Marshall to build a sawmill so he could continue to expand his empire, but unbeknownst to many, Sutter Sr.'s "empire" had been built on thin margins of credit. American period In 1848, when James W. Marshall discovered gold at Sutter's Mill in Coloma (some northeast of the fort), numerous gold-seekers came to the area, increasing the population. In August 1848, Sutter Sr.'s son, John Sutter Jr., arrived to assist his father in reducing his debt. The Sutters struggled to contain the effects of thousands of new gold miners and prospectors in the