Diversity jurisdiction requires complete diversity of citizenship. What does complete diversity mean?

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Complete diversity means that no plaintiff shares citizenship with any defendant. In other words, every plaintiff must be from a state different from every defendant's state of citizenship. Citizenship is determined by domicile—the place a person considers home at the time of filing. So if even one plaintiff is from the same state as any defendant, complete diversity is not present. For example, a case with a plaintiff from State X and a defendant from State X would lack complete diversity, even if other parties are from different states.