Mexico's economic situation improved in the 1950s with the Bracero Program and with a "Export-Import Bank approved $150 million loan to finance transportation, agriculture, and power facilities". Between 1954 and 1971, the Mexican economy stabilized under President Adolfo Ruiz Cortines and Adolfo López Mateos. This stability lasted until 1971, when the Mexican economy began to decline. One of the major reasons for such a prosperous economy at this time was Mexico's decision to nationalize its oil production. This nationalization and Mexico's modernization program helped to stabilize the economy. Another factor was the Korean War which "had increased world prices, provided opportunities for Mexican exports, and led to the inflow of foreign capital". But by the late 1960s, the Mexican economy was unable to finance itself, resulting in lower wages and worker discontent.