Congress is forbidden to lay 'any tax or duty.' The State is forbidden from laying imposts or duties 'on imports or exports,' that is, articles coming into or going out of the United States. Congress is forbidden to tax articles exported from any State.' . . . Congress may lay local taxes in the territories, affecting persons and property therein, or authorize territorial legislatures to do so, but it cannot lay tariff duties on articles exported, from one State to another, or from any State to the territories, or from any State to foreign countries, or grant a power in that regard which it does not possess. But the decision now made recognizes such powers in Congress as will enable it, under the guise of taxation, to exclude the products of Porto Rico; and this, notwithstanding it was held in De Lima v. Bidwell (182 U. S. 1; 21 Sup. Ct. Rep. 743; 45 L. ed. 1041), that Porto Rico after the ratification of the treaty with Spain ceased to be foreign and became domestic territory."
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exports
There are no states that are prohibited from taxing by the U. S. Constitution. Such a prohibition may or may not be placed in the State's Constitution or Charter or such.
congress can't tax exports, because it says it in the constitution.
Article 1 of the Constitution places several limits on the powers of Congress, including taxing exports from a state and granting titles of nobility. It also prevents Congress from suspending the passage of writs of habeas corpus.
Exports
exports...
interstate commerce
The framers decided that the legislative branch could set the taxing legislation.
yes
tax exports
Taxing and spending.
the purpose of the confederacy is to keep the congress from regolate commerce and taxing