 Although PRI administrations achieved economic growth and relative prosperity for almost three decades after World War II, the party's management of the economy led to several crises.Political unrest grew in the late 1960s, culminating in the Tlatelolco massacre in 1968.Economic crises swept the country in 1976 and 1982, leading to the nationalization of Mexico's banks, which were blamed for the economic problems (La Década Perdida).