USA HISTORY

Detailed explanation-1: -Beginning in 1863, the Union Pacific, employing more than 8, 000 Irish, German, and Italian immigrants, built west from Omaha, Nebraska; the Central Pacific, whose workforce included over 10, 000 Chinese laborers, built eastward from Sacramento, California.

Detailed explanation-2: -In 1862, Congress hastily passed the Pacific Railroad Act. This act led to the creation of the Union Pacific, which would lay rails west from Omaha, and the Central Pacific, which would start in Sacramento and build east.

Detailed explanation-3: -The Railroad Act of 1862 put government support behind the transcontinental railroad and helped create the Union Pacific Railroad, which subsequently joined with the Central Pacific at Promontory, Utah, on May 10, 1869, and signaled the linking of the continent.