Answer:
The monarchs felt threatened by Rousseau because he strongly believed that democracy was the best form of government. John Locke also didn't believe in the divine right of kings and that the government is supposed to protect people's natural rights.
Explanation:
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Dr. Rush practiced humoral theory and treated his patients with yellow fever by making them bleed or vomit (or draining fluids)
Many French doctors criticized him for his treatments and said he was not going to succeed.
At first, Rush made patients bleed less, but he then changed his treatment and made patients bleed and vomit more than before.
In total, the plague may have reduced the world population from an estimated 450 million down to 350–375 million in the 14th century.