Think about how railroads changed and developed.

Before the railroad, it took almost six months and cost $1000 to travel between California and New York. After the transcontinental railroad was completed, it cost $150 and took one week. For the first time, U.S. Americans could freely travel from coast to coast.

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several states had passed similar laws, but they were limited to intrastate businesses. the sherman antitrust act was based on the constitutional power of congress to regulate interstate commerce.

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