Q. In which year the Guatemalan coup d'etat, also code-named as "Operation PBSuccess", happened?
Answer: 1954
Notes: In the year 1954 the Guatemalan coup d'etat, also code-named as "Operation PBSuccess", happened. The 1954 Guatemalan coup d'etat, code-named Operation PBSuccess, was a covert operation carried out by the U.S. Central Intelligence Agency (CIA) that deposed the democratically elected Guatemalan President Jacobo Arbenz and ended the Guatemalan Revolution of 1944–1954. It installed the military dictatorship of Carlos Castillo Armas, the first in a series of U.S.-backed authoritarian rulers in Guatemala.