Which system for tax collection suggests that all states are equally important to the union

The correct answer is the Taxing and Spending Clause, along the Uniformaty Clause.

Explanation:

This system giver permission to the United States federal goverment to level up the taxes on every state equally for two reasons to pay the national debt and for the natural security defense.

d. william mckinley's southern upbringing him win.

c is your answer have a great day make the brainlest