Wikipedia????? That's about as reliable as the 'History' channel and I use that term very loosely.

It was implied, never written but implied, at the time of ratification and in order to ensure ratification by the states that if they disagreed they could succeed from the union. That was the 'mind set' of various politicians throughout the government both at the state and federal level through the later part of the 1700's and early 1800's.