He didn't. The first to invent it was William Blackstone in 1874. Alva Fisher invented the first electricity-powered washing machine in 1908.
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Hamilton E. Smith of Philadelphia, Pennsylvania patented one of the first mechanical washing machines in 1858. There was a crank on the machine that turned the paddle inside which then pushed laundry through the water.
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In his book The Wealth of Nations, Smith stated that industry and commerce, not just farming, were the most important sources of wealth. He also advocated free enterprise.
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