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Concurrent jurisdiction exists where two or more courts from different systems simultaneously have jurisdiction over a specific case. This situation leads to forum shopping, as parties will try to have their lawsuit heard in the court that they perceive will be most favorable to them.
In the United States, concurrent jurisdiction exists to the extent that the Constitution of the United States permits U.S. federal courts to hear actions that can also be heard by U.S. state courts. For example, where a party from Alabama sues a party from Florida for a breach of contract, the Alabama party can sue in either the federal court located in Florida (under its diversity jurisdiction) or in the state court located in Florida (under its personal jurisdiction over the defendant).
Concurrent jurisdiction in the United States can also exist between different levels of state courts, and between courts and other government agencies with judicial powers. Different countries can also share concurrent jurisdiction over a case, where different countries have authority over the parties or events giving rise to the cause of action.
Sections 1331-32 give federal courts concurrent jurisdiction with the state courts over federal question and diversity cases.