States are able to enact agreements with other states, without the consent of congress. these are called ratification.
A principal's approval of an action taken by an agent who lacked the legal capacity to bind the principal is known as ratification. If the parties intended to demonstrate their assent through such an act, ratification is defined as the international act in which a state expresses its consent to be bound by a treaty.
Ratification is not authorize by congress. A interstate agreement is authorize by congress . There are only few subject on which state shall make agreement with the consent of congress.
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