What were the "100 Days"?

100th day of Roosevelt’s presidency. It was June 11 of 1933.

Explanation:

“100 Days” refers to the beginning of a leading politician's term in office.

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necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.