The ROCOR and the OCA have a complicated history of cooperation, rivalry, and sometimes outright hostility. These two jurisdictions, the Russian Orthodox Church Outside Russia (ROCOR) and the Orthodox Church in America (OCA), both have their origins in the Church of Russia (a.k.a. the Moscow Patriarchate or MP), and their histories as clearly distinct and identifiable entities both stem from the Bolshevik Revolution in Russia in the early 20th century.
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