Answer: the invention of cotton gin
Explanation:The cotton gin refers to a a machine that sets aside cotton fibers from their seeds. Therefore, the invention of the cotton gin transformed the cotton industry in the United States and demanded cheap labor force, which led to the rise of slavery in the South and to the American Civil War later.
I think it’s D. Sorry if I’m wrong.
Answer:
Why were the early days of history called the dark ages?
Explanation:
Because there were so many knights!
1: California became popular because of the gold found.
2. More people began to make farms, making development for the state.
3. People from all over the country came to the united states for the found gold.