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Interchangeable parts were invented by Eli Whitney. Whitney made interchangeable parts to speed up the making of guns by having machines manufacturer each part. Interchangeable Parts saved time and money which affected society.

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Britain wanted to keep their technology Inventions a secret from other rival countries so they placed a law forbidding anyone to take the plans for the new machines. But Samuel Slater proved this law could not be approved. Samuel was a mechanic in a British textile mill. In 1789 Slater boarded a boat to New York City, crew searched Baggage of passengers to make sure know one was carrying plans but Samuel didn't need plans because he had it memorized. Later Slater meat with Morse Brown who had a mill in Pawcatuck Rhode Island. The mill was failing because the machinery was constantly braking, Salter decided to improve the mill and built what became the first successful textile mill in the United States.

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Francis Cabot Lowell found a better way to run British mills, in Britain they had two separate factors, one that spun thread and the other wove into cloth. Francis decided to try moving both systems into one factory. he built an new mill in waltham massachusetts. After Francis Passed away he partners took over and built an entire factory town and named it after him. in 1812 Lowell Massachusetts was a village of five farm families, But by 1836 it went up to 10,000 people

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in 1800 only 6% of the nations population lived in cities and in 1850 the percent had risen to 16%. But not until 1920 did more American citizens live in cities than rural areas. Cities started gaining more population as factories grew in cities. Compared to today's cities cities were small, you could walk from one side to the other in 30 minutes a lot has changed now.

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The Iron Plow was invented by Jethro Wood and improved by John Deere. Jethro Wood began the building of the Iron Plow with replaceable parts, John Deere however improved the Iron Plow. Plows before that were made by iron or wood would be very heavy and it was hard for the ox to pull and they were slow. But now the Iron Plow was lighter so the farming process was faster.

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After the mills were built they needed people to run them so people recruited girls which were referred to as the Lowell girls. The Lowell girls were early teen girls who were recruited from their farms to work in the factories. However the hours the girls would work were awful they would work 2 hours a day for 6 days a week and the pay was extremely low. Parents didn't know how dangerous this job would be Because they would have the younger skinnier girls run through the rows and change the thread, this was dangerous because if their shirt or something got caught in the machine it would suck them in.

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in 1834 philo stewart made a Cast Iron Stove that would fit in a average kitchen, His factories built a wooden stove as well that also took of with about 90,000 sales. But the cast iron stove wasn't the only factory that was changing people's lives.

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in 1846 a man named Elias Howe Pitched an idea about a sewing machine a few years later Isaac singer improved Howes machine. Soon clothing makers bought hundreds of the new machine, workers could not sew more shirts in the time it took to tailor one by hand.

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Cyrus McCormick opened a factory in 1847 in Chicago that produced mechanical Reapers. It was a house drawn machine that cut wheat and gathered other grains. His reaper could do the work of five workers by hand.

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By 1850 cities were growing more popular, mostly because factories started becoming more popular in those types of areas, but with population comes problems. One of the main problems in cities in 1850 was Health Problems. Because cities were becoming so popular more litter started piling up on the streets, there were also no sewers. Sewage and garbage would often flow into wells, streams and rivers polluting the water, And the water caused disease.