Vintage photos show 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.Bettmann/Getty ImagesWilliam 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.Amid renewed uncertainty over President Donald Trump's proposed tariffs, history might offer us clues as to how they could impact American life