Answer:
A. New technologies were invented.
B. Many people moved to the cities.
C. There were fewer farmers.
The late 1800s in the United States is also known as the Gilded Age. It is roughly considered to have begun in the years after the Civil War to about 1900. This was a time of rapid economic growth, particularly in the Northern and Western regions of the country. Modernization and new technology led to the expansion of industrialization. And this led to the rise of factories and cities and the decline of farms. At the same time, this was an era of large inequalities and poverty.