and partial feudalization of the Hungarians. Pop ignores that plenty Magyar artifacts and burial sites have been found in Transylvania from the 10th century. Dennis Hupchick writes the Hungarians began to populate the region actively from the 11th century. 19th century to present In the 19th century, the proportion of Hungarians in the Kingdom of Hungary rose gradually, reaching over 50% by 1900 due to higher natural growth and Magyarization. Between 1787 and 1910 the number of ethnic Hungarians rose from 2.3 million to 10.2 million, accompanied by the resettlement of the Great Hungarian Plain and Délvidék by mainly Roman Catholic Hungarian settlers from the northern and western counties of the Kingdom of Hungary. Spontaneous assimilation was an important factor, especially among the German and Jewish minorities and the citizens of the bigger towns. On the other hand, about 1.5 million people (about two-thirds non-Hungarian) left the Kingdom of Hungary between 1890–1910 to escape from poverty. The years 1918 to 1920 were a turning point in the Hungarians' history. By the Treaty of Trianon, the Kingdom had been cut into several parts, leaving only a quarter of its original size. One-third of the Hungarians became minorities in the neighbouring countries. During the remainder of the 20th century, the Hungarians population of Hungary grew from 7.1 million (1920) to around 10.4 million (1980), despite losses during the Second World War and the wave of emigration after the attempted revolution in 1956. The number of Hungarians in the neighbouring countries tended to remain the same or slightly decreased, mostly due to assimilation (sometimes forced; see Slovakization and Romanianization) and to emigration to Hungary (in the 1990s, especially from Transylvania and Vojvodina). After the "baby boom" of the 1950s (Ratkó era), a serious demographic crisis began to develop in Hungary and its neighbours. The Hungarian population reached its maximum in 1980, then began to decline. For historical reasons (see Treaty of Trianon), significant Hungarian minority populations can be found in the surrounding countries, most of them in Romania (in Transylvania), Slovakia, and Serbia (in Vojvodina). Sizable minorities live also in Ukraine (in Transcarpathia), Croatia (primarily Slavonia), and Austria (in Burgenland). Slovenia is also host to a number of ethnic Hungarians, and Hungarian language has an official status in parts of the Prekmurje region. Today more than two million ethnic Hungarians live in nearby countries. There was a referendum in Hungary in December 2004