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 that the most important thing you need to realize is that you are not falling behind, you are surviving a pandemic.
The heliocentric theory of the universe differed from the geocentric theory is that the heliocentric theory put the Sun in the middle of the Universe, whereas the geocentric theory put the Earth in the center, which was the go-to theory for the Church throughout a great deal of history.
In this quote, Thurgood Marshall is talking about the time between the signing of the Emancipation Proclamation (which was supposed to free slaves in the Confederacy) to the Brown vs. Board case which ruled that "separate but equal" is unconstitutional.
The reason he brings up these two events is because it shows how little progress American society has changed in these 90 years. Even though African-Americans were supposed to be free citizens after the Emancipation Proclamation, they were still treated as second class citizens in the US. They were constantly targets of voter discrimination, violence, and prejudice.
The jews were not treated the same as the germans
