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In page Hesse:

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The parts of Hesse-Darmstadt on the left bank of the Rhine (Rhenish Hesse), as well as those right-bank areas of Hesse-Darmstadt and Hesse-Nassau within 30 km (19 mi) of Koblenz or Mainz were occupied by French troops until 1930 under the terms of the Versailles peace treaty that officially ended World War I in 1919. The Kingdom of Prussia became the Free State of Prussia, of which Hesse-Nassau remained a province.[citation needed]