The answer to that is c.
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The Kansas Nebraska Act on 1854 lead to the Civil war because both Kansas and Nebraska allowed the people to decide if they should or shouldn't allow Slavery into their borders.
Obviously the poor had no money, so the bosses of say New York would pay clueless immigrants to vote for them in elections to keep them in high city offices and to continue holding power.
Your two best options are:
ensures that the 12 notes are given equal important.
and:
is characterized by the works of Arnold Schoenberg.
the twelve-tone technique was made by Arnold Schoenberg and is also called "serialism" and "dodecaphony." It's a method that rejects keys.
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