Four major land reforms have taken place in Romania: in 1864, 1921, 1945 and 1991. The first sought to undo the feudal structure that had persisted after the unification of the Danubian Principalities in 1859; the second, more drastic reform, tried to resolve lingering peasant discontent and create social harmony after the upheaval of World War I and extensive territorial expansion; the third, imposed by a mainly Communist government, did away with the remaining influence of the landed aristocracy but was itself soon undone by collectivisation (considered by some as yet another land reform),[1] which the fourth then unravelled, leading to almost universal private ownership of land today.