Article 1, Section 8 of the Constitution stated that Congress had the power to make the laws under which the country shall be governed.
Article 6 of the Constitution stated that all laws and treaties made under the United States authority are considered as supreme Law of the Land. Therefore, judges in every state should grant justice according to these Laws.
Robert Yates, who participated in the Constitutional Convention, was highly skeptical of granting much power to a single central government, therefore, the fact that a central entity had the power to manage the supreme Law of the Land instead of delegating some of it to the states was something he opposed.