In 1948 the United Nations established the Economic Commission for Latin America (ECLA) in Santiago, Chile, to study economic development. Under the direction of Argentine economist Raúl Prebisch, ECLA produced one of Latin America’s most influential intellectual contributions of the twentieth century: a diagnosis of reasons why Latin America, like other less industrialized regions of the world, remained economically and technologically dependent on Europe and the United States, along with prescriptions for remedying that dependency. These ideas formed what became known as dependency theory.

According to dependency theory, countries in Latin America, Africa, and Asia were trapped in the position of borrowers of capital and technology, and producers of primary commodities such as agricultural and mineral goods. Since western Europe and the United States industrialized in the nineteenth century, they secured a lasting economic advantage magnified by colonialism and neocolonialism, which reorganized production and consumption around the world for their benefit.

According to this analysis, the prosperity of Europe and the United States was built on the impoverishment of other regions of the world because the products that industrialized countries made were worth more than the agricultural or mineral exports of other nations. This inequality in the market value of goods increased over time as the relative value of commodities such as coffee or copper decreased relative to the value of manufactured goods like automobiles or technologically advanced goods like computer software.

How could this pattern be broken? One approach was modernization theory, championed by U.S. economist Walt Whitman Rostow. He suggested that societies passed through phases of development from primitive to modern, and that adopting the political, economic, or cultural practices of places like the United States was the best remedy for poverty. Modernization theory shaped foreign aid programs: the U.S. government deployed armies of experts around the world to advise governments and communities on how to modernize. These technicians often did not understand local conditions, believing that the American way was the only way, and these projects were often riddled with unintended negative consequences. As a result, many people began to mistrust these experts.

To peoples emerging from colonialism, dependency theory offered a more appealing path. Dependency theorists rejected liberalism because they believed free-market capitalism reinforced social and economic problems by inhibiting the accumulation of wealth in dependent regions. Instead they favored state intervention to remake national economies so that resources would be distributed more equitably. Prebisch advocated a practice that became common in much of the world: import substitution industrialization (ISI). Under ISI policies, countries imposed trade barriers to keep certain foreign products out and provided subsidies to develop domestic industries that could make the same goods. Some dependency theorists suggested that even ISI was not enough, and that deeper social reforms were needed, such as the redistribution of farmlands from large landowners to rural workers, as well as state control of major industries and banks.

The governments that attempted land redistribution or the nationalization of foreign firms often faced a fierce backlash by landowners, foreign corporations, and political conservatives. In many cases, reformist governments were deposed in military coups supported by the United States. The U.S. reaction against reformers in countries like Guatemala, where the elected government was overthrown in a coup organized by the United States in 1954, pushed reformers in other countries into more radical and defiant approaches. In Cuba a revolutionary movement led by Fidel Castro took power in 1959. Castro’s regime executed a deep social and economic transformation of Cuba, including the redistribution of land and urban properties. This pressure from the United States pushed revolutionary Cuba into an alliance with the Soviet Union. The Argentine military strategist who worked closely with Castro, Che Guevara, became an icon of radical revolutionary liberation. He built his ideas for social change into a revolutionary theory, Guevarism, which suggested that private property and wage labor were forms of exploitation that could be overthrown by free workers volunteering their labor to help liberate others.

One of the most influential areas where the idea of liberation crystallized was a movement within the Catholic Church called liberation theology. The movement emerged in Latin America amid reforms of church doctrine carried out by Pope John XXIII (pontificate 1958–1963), who called on clergy to engage more directly with the contemporary world. In 1968 the Latin American Council of Bishops gathered in Medellín, Colombia, and invoked dependency theory as it called on clergy to exercise a “preferential option for the poor,” by working toward “social justice,” including land redistribution, the recognition of peasants’ and labor unions, and denouncing economic dependency and neocolonialism.

Drawing on dependency theory and sometimes verging on revolutionary Marxism, priests attracted to liberation theology often challenged governments and fought against landowners and business owners they saw as oppressors. After the 1970s, Popes John Paul II (pontificate 1978–2005) and Benedict XVI (pontificate 2005–2013) suppressed liberation theology and silenced its most outspoken thinkers. Advocates of liberation theology greeted the naming of a pope from Latin America, Francis, in 2013 as a return to the focus on fighting poverty and social exclusion within the Catholic Church.