It was "Andreas Vesalius" who was the sixteenth-century physician who published the first accurate and detailed picture of human anatomy, since he was one of the most advanced and knowledgable surgeons of his time.
I believe it is Religious Beliefs
The larger number of people requiring assistance led to a focus on social reform and group work, spending decreased, unemployment grew, banks closed, taxes rose, reparations, and trade collapsed.
They were afraid of large numbers of Jews coming in from (in the case of the St. Louis) Germany. 900 people is a lot of people but it would only be the tip of the iceberg if people were allowed to cross the Atlantic and go into the United States. There was a quota of how many people could come in and the US wanted to keep to the quota system.
The United States (at the time of the St. Louis sailing) was neutral, so they also didn't want to endanger that neutrality.
I think it is indoor plumbing
