Based on the graph attached below, we can observe there is a sharp increase from the 1850s. The reason behind that increase is the Act of Consolidation in 1854, which the borders until that time expanded and resulted with the modern borders of Philadelphia. Indeed, the correct answer is an increase in the number of housing unit.
Answer:
However, military officials have been interested in psychiatric issues ... However, by the end of the war, the general opinion among both psychiatrists and ... that only around 40% of all cases of nervous breakdown took place overseas (and only a ... After World War II, most psychiatrists considered aiding returning soldiers
The Cold War was a long struggle between the<em> United States</em> and the <em>Soviet Union</em> that began in the bad after-effects of the (giving up in a fight) of <em>Hitler's Germany</em>. The two superpowers slowly built up their zones of influence, dividing the world into two opposite (or fighting against) camps.
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Railroads played an absolutely crucial role in the Industrial Revolution, since they made for the incredibly fast transfer of goods such as iron and steel that were used to build things--not to mention the transport of the workers themselves.
