Greek League (EDES). In subsequent years (1945–1949), the mountains of Epirus also became the scene of some of the fiercest fighting of the second and bloodier round of the Greek Civil War. The final episode of the war took place on Mount Grammos in 1949, ending with the defeat of the Communists. Peace returned to the region in 1949, although because of official Albanian active involvement in the civil war on the side of the communists, the formal state of war between Greece and Albania remained in effect until 1987. Another reason for the continuation of the state of war until 1987 was that during the entire period of Communist rule in Albania, the Greek population of Northern Epirus experienced forced Albanisation. Although a Greek minority was recognized by the Hoxha regime, this recognition only applied to an "official minority zone" consisting of 99 villages, leaving out important areas of Greek settlement, such as Himara. People outside the official minority zone received no education in the Greek language, which was prohibited in public. The Hoxha regime also diluted the ethnic demographics of the region by relocating Greeks living there and settling in their stead Albanians from other parts of the country. Relations began to improve in the 1980s with Greece's abandonment of any territorial claims over Northern Epirus and the lifting of the official state of war between the two countries. The collapse of the communist regime in Albania in 1990–1991 triggered a massive migration of Albanian citizens to Greece, which included many members of the Greek minority. Since the end of the Cold War, many Greeks in Northern Epirus are re-discovering their Greek heritage thanks to the opening of Greek schools in the region, while Cham Albanians have called for compensation for their lost property. In the post–Cold War era, relations have continued to improve though tensions remain over the availability of education in the Greek language outside the official minority zone, the minority's property rights, and occasional violent incidents targeting members of the Greek minority. Economy A rugged topography, poor soils, and fragmented landholdings have kept agricultural production low and have resulted in a low population density. Animal husbandry is the main industry and corn the chief crop. Oranges and olives are grown in the western lowlands, while tobacco is grown around Ioannina. Epirus has few natural resources and industries, and the population has been depleted by migration.