The creations of tin pan alley were culturally significant because they:
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a. were the first american music that was exported abroad.
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b. resulted from the great migration.
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c. represented a truly american musical form.
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d. were created exclusively by african american musicians.

b. africa to the americas

explanation:

roosevelt, a progressive reformer, earned a reputation as a "trust buster" through his regulatory reforms and anti-trust prosecutions. his "square deal" included regulation of railroad rates and pure foods and drugs; he saw it as a fair deal for both the average citizen and the businessmen.