Final answer:
In 1882, the Chinese Exclusion Act prohibited all Chinese laborers from immigrating to the United States, which was a reflection of the racial intolerance and discrimination against Asian Americans during that time.
Step-by-step explanation:
The immigrant laborers who were completely excluded from the United States in 1882 hailed from China. This was enacted through the Chinese Exclusion Act of 1882, which specifically prohibited all Chinese laborers from entering the country. The act was part of a larger trend of increasing restriction on immigration, particularly from Asia, and it contributed to an atmosphere of racial intolerance and discrimination against Asian Americans during that era. It wasn't until the 1940s, during World War II, after being allied with China against Axis powers, that the law was repealed and replaced with a limited quota system.