A is correct because the Supreme Court in the Plessy v. Ferguson decided that the separate but equal law was constitutional.
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The US Congress acted to regulate the practices of business during the gilded age by not creating any law for the growth of monopolistic businesses.
Option A is the correct answer.
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What is a monopoly?</h3>
A monopoly is a type of economic market where there is a sole seller in respect of selling a certain kind of product with no close substitutes.
Gilded Age was the time period of increase in the economic growth of the US country from the year 1870 till the year 1900. It was the time span where the US country flourished its businesses in the large sector of the economy like factories, mining of coal, and building of railroads.
Therefore, there was no law passed for encouraging monopolistic businesses in the Glided age by the US congress.
Learn more about the glided age in the related link:
brainly.com/question/21199270
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