Describe the essential and dangerous work Chinese immigrant laborers performed building the Central Pacific Railroad, and the unequal treatment and discrimination they faced.
The Central Pacific's hardest stretch of track ran directly through the granite of the Sierra Nevada, and the workforce that made it possible was overwhelmingly Chinese immigrant laborers -- at times more than 80 or 90 percent of the Central Pacific's entire workforce. Their work included blasting tunnels through solid rock, sometimes while suspended in woven baskets on sheer cliff faces to place explosives, and continuing through brutally cold Sierra winters. This was some of the most dangerous labor of the entire project, and it was Chinese workers who performed most of it.
Despite this essential and courageous contribution, Chinese workers were paid less than white workers for the same labor, often had to supply their own food and shelter when white workers did not, and were left out of the famous 1869 golden-spike photograph at Promontory Summit entirely. Discrimination continued after the railroad was finished: California had already taxed foreign miners unfairly during the Gold Rush, largely targeting Chinese and Latin American miners, and in 1882 the United States passed the Chinese Exclusion Act, the first major U.S. law to ban immigration based on nationality. The honest history here holds two true things together: Chinese immigrants were essential to building modern California, and they were treated with serious, documented unfairness while doing it.
Mastery looks like: They can state that Chinese immigrants were the majority of the Central Pacific workforce and name at least one specific unfair treatment they faced.
Common stumbles: Learning only about the achievement without the mistreatment, or the reverse; not connecting this to the later Chinese Exclusion Act.