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Generally speaking, pleading and establishing federal diversity jurisdiction is not a complicated affair. The rule of complete diversity is familiar to every lawyer who survived first-year civil procedure: The plaintiffs must be citizens of different states than the defendants. The corollary rules are that individuals are citizens of the state where they reside, and corporations are citizens of both the state in which they are incorporated and the state in which they have their principal place of business. In 2010, the U.S. Supreme Court clarified in Hertz Corp. v. Friend that the latter phrase means the corporation’s “nerve center.” But, what about the citizenship of a limited liability company (LLC) whose sole member is a corporation? Or what about the increasingly commonplace situation where an LLC has members composed of individuals, corporations, partnerships or other limited liability companies?