How did Mapp v. Ohio set a legal precedent?

The case of Mapp v. Ohio, decided by the U.S. Supreme Court on June 19, 1961, strengthened the Fourth Amendment protections against unreasonable searches and seizures by making it illegal for evidence obtained by law enforcement without a valid warrant to be used in criminal trials in both federal and state courts.

Explanation:

straight down to hell mate

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.