C. Unit North and South Korean under a communist government
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Musicals emerged primarily from the European Operetta which is a lighter version of the popular opera.
The operetta is a drama-musical production that is almost like the opera structurally. But the difference is that the plot is usually full of romance dramas alongside with music.
A lot of dance scenes and dialogues are also incorporated in them. One big difference was that the operettas were usually shorter than the operas.
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D Although the U.S. had ramped up its industry during the first world war, it still did not have its full industrial capacity maximized until 1942 during world war 2. It was not "the" world leader in industry, however it was on the top of the list
