evidence: Beginning in the 1920s, Serbia was an integral part of Yugoslavia (meaning "Land of the South Slavs"), which included the modern countries of Serbia, Croatia, Slovenia, Bosnia and Herzegovina, Kosovo, North Macedonia, and Montenegro. Long ruled in turn by the Ottoman Empire and Austria-Hungary, these component nations combined in 1918 to form an independent federation known as the Kingdom of Serbs, Croats, and Slovenes. In 1929 that federation was formally constituted as Yugoslavia. Serbia was the dominant part in this multiethnic union, though after World War II the nonaligned communist government of Josip Broz Tito accorded some measure of autonomy to the constituent republics and attempted to balance contending interests by dividing national administrative responsibilities (e.g., for intelligence and defense) along ethnic lines. [...] The landforms of Serbia, a landlocked country, fall into regional groupings that roughly parallel the republic’s major political divisions. The plains of the northern Vojvodina region generally lie at elevations between 200 and 350 feet (60 to 100 metres) above sea level. The Fruška Gora hills interrupt these plains on the west, stretching along a triangle of land between the Danube and Sava rivers. Their highest point is 1,765 feet (540 metres). Much of the Vojvodina is blanketed by portions of a former plateau that rose up to 100 feet (30 metres) above the territory’s floodplains; the remnants are composed of fine particles of loess deposited by winds during the last glacial period in Europe.