Answer: Medieval doctors did not have a clue what caused disease. Most doctors still believed the Greek theory from Galen, a doctor during the Roman Empire, that you became ill when the 'Four Humours' - phlegm, black bile, yellow bile, blood - became unbalanced.
I think Abraham Lincoln opposed the law and believed slavery was a moral issue
Enlightenment principles called for freedom of thoughts,individualism, liberty, skepticism and reason,especially skepticism to traditional religious views.
The period after the ww1 broke out, saw an increased wave of revolutions,across the century, agitating for freedom and liberty, as well as the fall of collectivization or communism to the rise of capitalism, and increased secularization of society. enlightenment thoughts were therefore highly successful.
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To learn the importance of the past and how it affects the future.