The Cuban Revolution succeeded in 1959 in the face of official U.S. opposition, an abortive Bay of Pigs invasion, and an economic embargo. Cuban dependence on the United States dated to the U.S. occupation of the island from 1898 to 1901 and subsequent interventions in 1906-1909, 1912, and 1917. Historically, the Cuban economy has depended on the export of sugar. Before the revolution the United States imported the largest share of Cuban sugar; after 1960 the Soviet Union assumed this role, and in exchange Cuba had to import its fuel and some of its foodstuffs, raw materials, and capital goods.