What major national-level development happened in the late nineteenth century?

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In the late nineteenth century, the federal government passed several acts to regulate interstate commerce and prevent the growth of monopolies, such as the Interstate Commerce Act (1887) and the Sherman Antitrust Act (1890). These were significant national-level developments that led to increased federal intervention in the economy. The Constitution was ratified in 1787, the Civil War ended in 1865, and the New Deal policies were implemented in the 1930s, all outside of the late nineteenth century time frame.

What Major National-Level Development Happened in the Late Nineteenth Century