Answer:
In the late 1800s, the United States experienced a tremendous growth in industrialization. Led by oil, steel, and other manufacturing industries, the United States had become the world’s leading producer of manufactured goods by 1900.
Explanation:
A slave is a person that belongs to another one and is treated as property. Serfs, I'm not so sure about this now, were renting the land out from the landowners.
Because it was growing more and more popular and more people were becoming Christians.
