Most ethnic Hungarians live in the neighboring countries, most notably in Romania, Slovakia, Serbia and Ukraine. The Hungarian presence in these countries is related to the Treaty of Trianon, which awarded former territories of the Austro-Hungarian Empire to the newly born nation-states in the region, leaving Hungarian communities “stranded” in now foreign countries.
Later on, the events of World War II and the Revolution of 1956 resulted in waves of emigration, with Hungarians fleeing the country by the hundred thousands. Many of those who left at the time now live in Western Europe or overseas. Although most of them have been living abroad for decades (or even their entire life), many of them are Hungarian nationals or eligible for Hungarian citizenship.