The occupational classification that included doctors, lawyers, and dentists in 1880 was the 'professional service' category. It would not be agriculture, fisheries, and mining because those professions are not in that field.
In the months leading up to World War I, the United States wanted to maintain its neutrality because...
the U.S. was trading heavily with European nations and did not want its business interrupted.
The second World War greatly reshaped ideas about national identity in America, especially for first-generation immigrants, second-generation immigrants, and African-Americans. During the war - and in the midst of the war effort - immigrants and African-Americans were welcomed into the armed services and, also, in areas of production where support was needed. Many Americans, during this time, were able to somewhat relax or surrender their prejudices. Also, for immigrants and African-Americans, they often felt they were part of American industry and service for the first time.
The excerpt provides an example of the regulating zoning responsibility of the local government. This can be proven with the definition of zoning which is; divide into or assign to zones, in particular. When compared to the example provided the definition seems to fit.
Blue collar workers we're targeted