One reason why many radio stations opted for a local or regional approach in the 1950s was:

a. audiences for popular music shifted from radio to television
b. black populations growing in rural areas
c. the development of gramophone technology
d. the proliferation of music recordings

The correct answer is A. audiences for popular music shifted from radio to television

Explanation:

In 1948 the radio reached its peak in relation to financial success. However, after 1948, national media dominated by network radio succumbed from 46% in 1945 to 25% in 1952. In the late 1950s, most radio stations disengaged from networks, switching to cheaper programs. Thus, the radio was transformed from a national to a local advertising medium, and its centrality in american popular culture was quickly occulted by television.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

i just did something on this guy a few days a go give me two minutes to find it in my notes.