There are two provisions in the US Constitution that do this. This first as to all acts by states is that the US Constitution is the supreme law of the land. Any state action that contradicts either the Constitution or act of the United States is invalid. The second is that the Constitution forbids states from making treaties with foreign nations.
In the US, it is the Chief of State or President that makes treaties with other nations.
The executive branch of a government is typically responsible for negotiating and entering into treaties with other countries. In the United States, for example, the President has the authority to negotiate and sign treaties, although they must be approved by the Senate.
The senate approves and disapproves treaties but the executive branch makes the treaties with the other countries!
In the United States the President makes treaties with the consent of the Senate. The direct answer to your question is : The Senate gives advice and their consent on US of A treaties. Read Article II of the Constitution for info on the powers of the Executive branch. It addresses this question wonderfully in Section 2.
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•Interprets the laws. •Makes sure they are faithfully applied. •Deals with cases involving the Constitution, -Federal Laws,treaties and -disputes between states •Interprets the laws. •Makes sure they are faithfully applied. •Deals with cases involving the Constitution, -federal laws,treaties and -disputes between states
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The United States of America