McRae, Cameron

The invention of the cotton gin revolutionized the difficult and time-consuming work of cleaning cotton. Many people became wealthy from the production of cotton, but it also led to an increase in slavery. The invention of the cotton gin led to other inventions such as the cotton picker.

The development of the railroad made travel much easier, changing the course of American history. The railroad opened up the West to settlers, resulting in social and demographic changes in the United States. The improvements in travel brought by the railroad led to other inventions such as diesel engines, cars and airplanes.

The invention of the reaper revolutionized the difficult and time-consuming work of harvesting wheat. Farmers could now harvest and sell more wheat, and fewer people were needed to work on farms, resulting in a migration to the cities. Improvements brought by the reaper led to other inventions such as threshers and combine harvesters.