Cossacks led an uprising, called Koliivshchyna, starting in the Ukrainian borderlands of the Polish–Lithuanian Commonwealth in 1768. Ethnicity was one root cause of this revolt, which included the Massacre of Uman that killed tens of thousands of Poles and Jews. Religious warfare also broke out among Ukrainian groups. Increasing conflict between Uniate and Orthodox parishes along the newly reinforced Polish-Russian border on the Dnieper in the time of Catherine the Great set the stage for the uprising. As Uniate religious practices had become more Latinized, Orthodoxy in this region drew even closer into dependence on the Russian Orthodox Church. Confessional tensions also reflected opposing Polish and Russian political allegiances.