After all, we did love playing a prank on him.
The primary assumptions were that the Executive Branch, in the "prosecution of war", has the right to take every precaution and every action in order to prevent espionage and other domestic threats.
This was tied to the assumption that Japanese Americans presented a danger to the United States, and that their ultimate loyalty was to the Japanese Empire.
The factors which promoted the development of new forms of entertainment were (A). The new middle class had leisure time and extra money.
With more leisure time and money to spend, middle class people turned to alternate and upcoming forms of entertainment such as dance halls, carnival rides and professional sports.