What role did the military play in many latin american countries during the 1920s and 1930s? use specific examples to support your answer.

Assuming you mean the military of the USA, in the 1920s the US military engaged in a series of military interventions called Banana Wars in order to keep the economic climate in the area friendly to American commercial interest. They were called Banana Wars because the main interest was from fruit companies. In the 1930s FDR's Good Neighbor Policy toned down American involvement in the area.