According to the us' constitution, any tax levied by the government must be the common defense or general welfare.
The Congress shall have the authority to levy and collect taxes, duties, imposts, and excises in order to pay debts, provide for the general welfare of the United States, and to provide for the common defense. However, all duties, imposts, and excises must be uniform across the country.
In order to pay off debts, provide for the common defense, and promote the general welfare of the United States, Congress shall have the authority to impose and collect taxes, duties, imposts, and excises; however, all such levies must be uniform across the country.
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