One of the most important and memorable events of the United States' westward push across the frontier came with the discovery of gold in the lands that became California in January 1848. Located thousands of miles away from the country's power centers on the east coast at the time, the announcement came a month before the Mexican-American War had ended, and among the very few Americans that were near the region at the time, many of them were Army soldiers who were participating in the war and garrisoned there. San Francisco was still best known for being a Spanish military and missionary outpost during the colonial era, and only a few hundred called it home. Mexico's independence, and its possession of those lands, had come only a generation earlier.

The flow of Chinese immigrants increased dramatically in 1852, sparked in large part by a crop failure in southern China that caused the custom houses in San Francisco to swell with 20,026 Chinese arrivals. Even more Chinese came as news reached China about the apparent ease of mining in California. By the end of the decade, ⅕ of the population of the Southern Mines consisted of Chinese miners. Chinese miners would become known as the most industrious and tireless of the miners, finding gold in claims that previous owners had thought depleted and persisting in mining an area far longer than others who eventually left the fields altogether.

In many ways, this represented the start of an influx of immigrants coming from Asia to the United States, kicking off an often turbulent relationship and history that would lead to alienation, conflicts, immigration quotas, and more. This book looks at that history from the start, and how it affected those who came from Asia in the 19th century.