Article iv, section 1, of the constitution define the relationship between the state and federal governments by stating that:

All states must accept the laws and records of other states as valid.

Explanation:

Section 1 said that when a state sanction a public act, record or judicial proceeding according to the manner in which Congress´s law prevented, these must be recognized by other states.

  This was made to unify the individual states and not destroying their power.

  There are very cases in which the United States Supreme Court ruled that the merits of a case in one state, must be recognized by the courts of other states.

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