Recognize a comma splice when you see one. A comma splice, also called a run-on, occurs when a writer has connected two main clauses with a comma alone. A main clause makes a complete thought, so you should not find a wimpy comma struggling to join two such powerful clauses. The problem looks like this: Main Clause + , + Main Clause.
In the United States, the term treaty is used in a more restricted legal sense than in international law. U.S. law distinguishes what it calls treaties from congressional-executive agreements and sole-executive agreements.
American law is that international accords become part of the body of U.S. federal law. Consequently, Congress can modify or repeal treaties by subsequent legislative action, even if this amounts to a violation of the treaty under international law. This was held, for instance, in the Head Money Cases.