The implementation of a federal income tax can be considered as part of Progressive Era reforms because it taxed people in proportion to their wealth and funded federal government reform efforts.
Income taxes in the US are compelled by the federal government and other states also. This is generally enforced by the federal government, so it is called as the federal income tax.
That type of tax is basically charged on the income of an individual, because it taxed people in proportion to their wealth and funded federal government reform projects, the espousal of a federal income tax can be comprehended as a component of Progressive Era reforms.
Therefore, option 2 is correct.
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