In this state of things, the acts of Congress could in various cases be only complied with, through the intervention of thirteen separate State Assemblies. The power given to Congress to adjust the affairs of foreign relations, was rendered almost nugatory by the diversity of commercial regulations of separate States. It became possible, that a separate State might be at variance with a foreign nation, on affairs not at all interesting to the other members of the Union, and that internal discord might arise from opposite interests, rivalship in commerce, the distribution of territory, and a variety of other latent causes.[112] To avoid {181} these inconveniences and dangers, the constitution was framed by a convention of delegates from the States, whose session ended on the 17th of September, 1787. A Congress was elected on the new establishment, and General Washington was unanimously appointed President in the succeeding year.[113] The constitution vests the legislative power in a Congress, consisting of a House of Representatives, and a Senate, and the executive power in the President. The members of the House of Representatives are elected biennially by the people. Each State has at least one representative, and not more than one for every thirty thousand persons in it, and two Senators, who are elected by the State legislature, at intervals of six years, and are distributed into three classes, so that the seats of a third part of them are vacated biennially. The President, and Vice-President are elected for four years by the ballot of electors appointed by the legislatures of the States; the number of electors in each State being equal to that of the representatives and senators, whom the same state has a right to send to Congress.