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Tenements were apartments in poor conditions shared by many people and were overcrowded. They had communal bathrooms they had to share and consisted of very poor families. These were popular during the Great Depression because of the terrible economy in which poverty was at an all time high.
The main reason why division made this possible is because it was impossible for a single leader to oversee both halves, meaning that communication between two leaders was weak. This led to differences in military strategy that led to enemy incursions.
Answer:
science, technology, engineering, art, philosophy
