Answer:
mass production
Explanation:
Factories began using mass production which promoted unskilled labor, not skilled labor.
The early part of the 20 century
Answer:
The anti-slavery movement
Explanation:
After escaping from slavery in Maryland, he became a national leader of the abolitionist movement in Massachusetts and New York, gaining note for his oratory and incisive antislavery writings.
<span>C.Coal-powered blast furnaces</span>