At the 1815 Congress of Vienna, Frederick Francis joined the newly established German Confederation, and like his Strelitz cousin Charles II, was elevated to the title of a "Grand Duke of Mecklenburg-Schwerin". In 1819 serfdom was finally abolished in his dominions. The Mecklenburg governance was still determined by the 1755 inheritance agreement ("Landesgrundgesetzlicher Erbvergleich"), which upheld the medieval hierarchy of the estates, which largely affected the social and economic development of both grand duchies. During the revolutions of 1848, the duchy witnessed a considerable agitation in favour of a liberal constitution. On 10 October 1849 Grand Duke Frederick Francis II (1823–1883) granted a new Basic law elaborated by his First Minister Ludwig von Lützow. In the subsequent reaction of the Mecklenburg nobility, backed by the Strelitz grand duke George, all the concessions which had been made to democracy were withdrawn and further restrictive measures were introduced in 1851 and 1852.