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A cause of action is a combination of facts giving rise to a claim or right to sue in UK law. It provides the basis for commencing court proceedings in order to obtain an appropriate remedy by law. In other words, a cause of action is the justification for bringing legal proceedings. (FindLaw UK)

court of first instance 1. (Law) a court in which legal proceedings are begun or first heard (Collins English Dictionary)

The parties agree that jurisdiction and venue for any legal proceedings arising from or in any way connected to this Agreement will lie in the United States District Court, Western District of Virginia or Frederick County, Virginia, and both parties hereby submit and consent to the jurisdiction and venue of said courts. (contracts.onecle.com)

A cause of actionis a combination of facts giving rise to a claim or right to sue in UK law. It provides the basis for commencing court proceedings in order to obtain an appropriate remedy by law. In other words, a cause of action is the justification for bringing legal proceedings. (FindLaw UK)