What major change in the United States occurred between the Civil War and the 1920s?
People returned to their farms where crops grew thanks to new equipment and fertilizers.
Balanced urban and rural growth led to less crowded conditions in the cities.
City populations grew rapidly as both immigrants and native-born citizens looked for higher paying jobs.
That would be the Industrial Revolution. Machinery replaced alot of labor positions for things such as factory workers. Eli Whitney invented the cotton gin, so you wouldn’t see row upon row of former slaves in the cotton fields from sun up to sun down. It also introduced the first automobile (Henry Ford’s Model T), the wright brothers flew the first plane at Kittyhawk, N Carolina, and ships began to get bigger and bigger (Titantic sank in 1914, largest ship at the time in the world and thought to be “unsinkable”).
for purposes of your question though, it is #3.
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