The historical context for workers' rights in the United States is that worker's unions fought for the rights of workers after the Great Depression.
This refers to the benefits and entitlements that a worker on paid employment has which are reserved for him and protect his interests in the workplace.
Hence, historically in the United States, there was nothing like worker's rights because there was cheap labor due to the terrible economy but it was not until there was a worker's union that the people began to strike and protest and a consensus was reached.
This led to workers getting things like paid leave, medical allowance, wardrobe allowance, and other perks which are enjoyed today.
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