American River in the context of Coloma, California

James Wilson Marshall (October 8, 1810 – August 10, 1885) was an American carpenter and sawmill operator, who on January 24, 1848, reported the finding of gold at Coloma, California, a small settlement on the American River about 36 miles northeast of Sacramento. His discovery was the impetus for the California gold rush. The mill property was owned by Johann (John) Sutter who employed Marshall to build his mill. The wave of gold seekers turned everyone's attention away from the mill which eventually fell into disrepair and was never used as intended. Neither Marshall nor Sutter ever profited from the gold find.

Sacramento is the capital city of the U.S. state of California. The county seat of Sacramento County, it is located at the confluence of the Sacramento and American Rivers in the Sacramento Valley. It is the fourth-most populous city in Northern California, sixth-most populous city in the state, and 35th-most populous city in the United States, with a population of 524,943 at the 2020 census. The Sacramento metropolitan area, with 2.46 million residents, is the 27th-largest metropolitan area in the country.

Before the arrival of the Spanish, the area was inhabited by the Nisenan, Maidu, and other indigenous peoples of California. In 1808, Spanish cavalryman Gabriel Moraga surveyed and named the Río del Santísimo Sacramento (Most Holy Sacrament River), after the Blessed Sacrament. In 1839, Juan Bautista Alvarado, Mexican governor of Alta California, granted the responsibility of colonizing the Sacramento Valley to Swiss-born Mexican citizen John Augustus Sutter, who subsequently established Sutter's Fort and the settlement at the Rancho Nueva Helvetia. Following the American Conquest of California and the 1848 Treaty of Guadalupe-Hidalgo, the waterfront developed by Sutter began to be developed and incorporated in 1850 as the City of Sacramento. In 1852, the city offered its county courthouse to the state of California to house the state legislature, resulting in the city becoming the permanent state capital in 1854 and ushering in the construction of a new state capitol building which was finished in 1874.

The Nisenan are a group of Native Americans and an Indigenous people of California from the Yuba River and American River watersheds in Northern California and the California Central Valley.

According to a 1929 archeology and ethnology press release by University of California, Berkeley, the Nisenan people are classified as part of the larger group of Native Americans known as the Maidu, though some dispute the accuracy of this relationship, including the Nisenan themselves. According to the Nisenan website, the United States' claim that they are Maidu is a misclassification and is inaccurate. As the Nisenan put it,

The Maidu are a Native American people of northern California. They reside in the central Sierra Nevada, in the watershed area of the Feather and American Rivers and in Humbug Valley. In Maiduan languages, maidu means "person".

The South Fork American River is a major tributary of the American River in El Dorado County, California, draining a watershed on the western slope of the Sierra Nevada east of Sacramento. The river begins in pristine Desolation Wilderness and flows through the Sierra Nevada foothills. The river at Coloma was the site of James Marshall's discovery of gold at Sutter's Mill on January 24, 1848, which started the California Gold Rush. The South Fork of the American is "the most popular recreation stream in the West" for whitewater rafting in North America, e.g., 80,000 visitors in 2011. Professional whitewater rafting companies have been offering commercial rafting trips on the South Fork American River since 1978.