Why did congress pass the sixteenth amendment?

The 16th amendment was passed because many people believed that an income tax would provide a more stable source of income than tariffs (the chief way by which the US government had been financed throughout history to that point), but such a tax could not be imposed because the Supreme Court had ruled in Pollock v.

Explanation:

Passed by Congress on July 2, 1909, and ratified February 3, 1913, the 16th amendment established Congress's right to impose a Federal income tax.

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the right answer is d