what specific legislation was passed that contributed to the development of regulation during Theodore Roosevelts time as president?​

His presidency saw the passage of the Pure Food and Drug Act, which established the Food and Drug Administration to regulate food safety, and the Hepburn Act, which increased the regulatory power of the Interstate Commerce Commission.

Explanation:

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a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

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