After the expulsion of Ottomans from the territory of the Kingdom of Hungary and demarcating the so called Military Frontier region between the Kingdom of Hungary and the Ottoman Empire (1699-1718), approximately 40,000 Slovak families emigrated from Slovakia to the southern regions of Hungary over the course of the 18th century. Most of them moved to the area of the Great Hungarian Plain (Alföld), which extends over the current regions of Hungary, Romania, Serbia and Croatia.
