According to this document, how is representation in the House of Representatives and the Senate determined: "The House of Representatives shall be composed of Members chosen every second Year by the People of the several States... Representatives and direct Taxes shall be apportioned among the several the several States which may be included within this Union, according to their respective numbers, which shall be determined by adding to the whole number of free Persons, including those bound to Service for a Term of Years, and excluding Indians not taxed, three fifths of all other Persons... The Senate of the United States shall be composed of two Senators from each State, chosen by the Legislature thereof, for six Years..."