On May 10, 1869, a golden spike was driven at Promontory Summit, Utah, signaling the completion of the first transcontinental railroad in the United States. The railroad, built by the Central Pacific and Union Pacific companies, connected the existing eastern U.S. rail network with the Pacific coast. The 1,912-mile line revolutionized travel, trade, and communication, making the American West easily accessible and accelerating settlement. The railroad's completion marked a transformative moment in American history, fostering economic growth and cultural exchange while also contributing to the displacement of Native Americans.

The completion of the Transcontinental Railroad is a monumental event in American literature, symbolizing technological progress, national unity, and the conquest of the frontier. It is celebrated in works like Walt Whitman's poem 'To a Locomotive in Winter' and is a key element in the narratives of the Gilded Age. The railroad also features prominently in the literature of Chinese American experience, as thousands of Chinese laborers played a crucial role in its construction, a fact often explored in ethnic poetry and prose.