Revolutions of 1848 in the Austrian Empire even socialist currents resisted the Empire's longstanding conservatism. The events of 1848 were the product of mounting social and political tensions after the Congress of Vienna of 1815. During the "pre-March" period, the already conservative Austrian Empire moved further away from ideas of the Age of Enlightenment, restricted freedom of the press, limited many university activities, and banned fraternities. Conflicts between debtors and creditors in agricultural production as well as over land use rights in parts of Hungary led to conflicts that occasionally erupted into violence. Conflict over organized religion was pervasive in pre-1848 Europe. Tension came both from within
History of the Catholic Church in Germany various states within the Empire to increase their power and the Emperor's attempt to achieve the religious and political unity of the Empire. The immediate occasion for the war was the uprising of the Protestant nobility of Bohemia against the emperor (Defenestration of Prague), but the conflict was widened into a European War by the intervention of King Christian IV of Denmark (1625–29), Gustavus Adolphus of Sweden (1630–48), and France under Cardinal Richelieu, the regent of the young Louis XIV (1635–48). Germany became the main theatre of war and the scene of the final conflict between France and the Habsburgs