The diploma thesis deals with the causes, progress and consequences of the overthrow of the democratically elected and reform president of Guatemala - Jacobo Árbenz Guzmán in 1954 - the coup d'état of the "National Liberation Army" under the leadership of Carlos Castillo Armas and his "secret" US allies. The main reasons for the overthrow of the Árbenz's regime in Guatemala were the potential threat of "leaking of international communism" in the US sphere of influence, i.e. Western Hemisphere and threat of US economic interests in Guatemala which are interrelated with the agrarian reform declared by president Árbenz. The aim of this diploma thesis is to answer key questions related to the overthrow of president Árbenz in 1954. Keywords: Guatemala, USA, Jacobo Árbenz Guzmán, Carlos Castillo Armas, Dwight D. Eisenhower