Vintage photos show how tariffs shaped American life under Trump's tariff hero, William McKinley

The turn of the century saw a rise in labor movements as industry grew largely unregulated.

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• William McKinley came to power during a time of economic instability and inequality.
• As a congressman in 1890, he authored the most protectionist tariff act in US history.
• As president, his views on trade shifted toward a more reciprocal approach.

With President Donald Trump's tariff policies sending shockwaves through global markets, it's interesting...