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The proposed Constitution, so far from implying an abolition of the State governments, makes them constituent parts of the national sovereignty, by allowing them a direct representation in the Senate, and leaves in their possession certain exclusive and very important portions of sovereign power. This fully corresponds, in every rational import of the terms, with the idea of a federal government.

Alexander Hamilton, James Madison, Quentin P. Taylor, John Jay (1998). “The Essential Federalist: A New Reading of the Federalist Papers”, p.85, Rowman & Littlefield
The proposed Constitution, so far from implying an abolition of the State governments, makes them constituent parts of the national sovereignty, by allowing them a direct representation in the Senate, and leaves in