Answer:
C. to make sure America remains neutral and united
Explanation:
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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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The correct answer should be the train. Railroads were built and these helped people transfer goods and heavy things like machines all over the country. Railroads were key for everything in the 19th century.
