The Article you cite concerns the formation and function of that part of the government called the Congress. As it outlines and establishes it's delegated powers, it also prohibits the States from exercising those powers within the compact. Once outside the compact (no longer a signatory to the compact by exercising it's natural right to secede) a Sovereign State may take up its right of association of it's choosing. When the States dissolved their federal government of the AOC, ' in congress assembled', they were Sovereign. It was a perpetual union which they abolished by seceding from the Confederation. "We the people" of these individual Sovereign States established a compact outside the legal AOC government (a revolution by definition), and a new government which had not existed prior. The compact created the government, not the States. The compact (Constitution ) is not the government. The States existed before the compact and delegated such sovereignty as was necessary (the preamble).Thanks for your response.