Agriculture is the principal economic activity in Haiti. Subsistence crops include cassava, rice, sugarcane, sorghum, yams, corn, and plantains. Most Haitians own and farm tiny plots of land, and great population density has caused rural poverty and is also a factor in the country's extensive deforestation, which has contributed to the degradation of agricultural land. Haiti's major exports are light manufactures and coffee; other exports include oils, cocoa, mangoes, sugar, sisal, and bauxite. The United States is the country's leading trading partner. Industry in Haiti consists largely of light assembly of imported parts and the manufacture of textiles. There is also sugar refining and flour milling, and other foodstuffs are produced. Some bauxite and copper are mined, but other mineral deposits have barely been tapped. Remitttances from Haitians working abroad are also extremely important. Economic sanctions imposed by the United States and others to force a military regime to return power to the elected government, and again later because of the government's inability to meet aid conditions, further damaged the impoverished economy during the 1990s and early 2000s.