machines - a mechanically, electrically, or electronically operated device for performing a task, Cotton Gin - a machine that separates the seeds, hulls, and foreign material from cotton, steel plow - helped dirt not stick to the blade, and enabled farmers to plant huge wheat fields more efficiently, mechanical reaper - helped cut down wheat more efficiently, Barbed wire - twisted wires armed with barbs or sharp points, Interchangeable Parts - Making identical parts that can be put together to make a product, mass production - production of goods in considerable quantities usually by machinery, Free enterprise - freedom of private business to organize and operate for profit in a competitive system without interference by government, Supply and demand - the amount of goods and services that are available for people to buy compared to the amount of goods and services that people want to buy, Lowell Mills - The Lowell mills were 19th-century textile mills that operated in the city of Lowell, Massachusetts, Erie Canal - man-made river that connects Lake Erie to New York City, steamboat - a boat driven by steam power, telegraph - an apparatus for communication at a distance by coded signals, Bessemer steel - steel made by the Bessemer process, laissez faire - a doctrine opposing governmental interference in economic affairs,

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