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The Slater Mills was made in Rhode Island in 1793 by Samuel Slater. Slater was a professional mechanic and helped fix a mill. He built the first ever successful Textile mill that was powered by water. He ended up being very successful and had his own factory.

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The Interchangeable Parts were built in 1798 by Eli Whitney in Washington DC. Inventors started producing their products because the parts were spreading so quickly. The Interchangeable parts also saved time and money.

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The cities were so crowded that everything was chaotic and there were numerous problems and issues. For example, there was a lot of pollution going around because of so many people and there were 322,000 people that lived in the cities.

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The Iron plow was built in 1825 by Jethro wood. He was originally already an inventor.  The Iron plow had to be pulled by oxen when being transferred.

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Dorothea Dix was a school teacher working in Boston and wanted to help the sick and unfortunate people. In 1841, she went to a jail near Boston and some of the prisoners were very ill and she wanted to care for them. She helped legislators to fund a new mental hospital.

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These girls had to work in the mills in order to return home to marry. Many women even had to let their young daughters help work. Even though the hard work could be dangerous or risky, the women had freedom after working in the mills.

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The telegraph was invented by Samuel F. B. Morse. The telegraph was used for sending electrical signals along a wire. Morse also came up with a code of dots, dashes, and spaces to send messages. This became known as the morse code. On May 24th, Morse was able to set up his telegraph in the supreme court chamber in Washington.

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The reaper was a machine that gathered wheat and grains. It was built in 1847 by Cyrus McCormick. His Reaper could do the work of five people just using some hand tools. He opened a factory in Chicago that had Mechanical Reapers also and was successful.

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The early boarding houses in Lowell and New England mill towns two and a half story duplexes that were just made of wood. The dwellings usually housed 20 to 40 people and had a kitchen, dining room, parlor, a keeper's quarters, and ten bedrooms. Most of the people in the boarding houses were single.

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Railroad builders often found building the railroads difficult and they overcame many problems. It was also very hard because they replaced them with iron instead of wood. Over time, the railroads became much safer and faster. In 1850, a network of railroads had crisscrossed the Nation in the North and West. New York, Chicago, and Cincinnati became railroad centers. Railroads were important in Urban growth and increased Urban populations.