Enlightenment is when you are learning or understanding. Ignorance (the opposite) is when you have a lack of knowledge and understanding. Prejudice and superstition sprout from ignorance.
Enlightenment is freedom from ignorance.
The answer is going to be D monopolies, therefore in the late 1800s, which of the following helped leaders eliminate competition would be the monopolies. Hope this helps, yw.
World War I, which lasted through Jul 28, 1914 to Nov 11, 1918.
https://www.history.com/topics/world-war-i/world-war-i-history
Info at the link
The slave trade between Western Africa and the America's reached its peak in
the mid-18th century when it is estimated that over 80,000 Africans annually
crossed the Atlantic to spend the rest of their lives in chains.
It had a very positive impact because the 1920's was when many new technologies were introduced, one example being the the assembly line, which made many industries more productive and profitable.
Hope that helps!