Answer: obtain control of the Panama Canal Zone
Explanation:
Big Stick Diplomacy was a policy by Theodore Roosevelt which was embodied by the epithet "speak softly and carry a big stick; you will go far." It involved strategies on how to deal with other countries and it was used by the President Roosevelt(pictured) to acquire control of the Panama Canal Zone.
Panama had been under Columbia and when the United States wanted to build a canal there, Columbia and a French company involved in the construction raised their prices. The US used big stick diplomacy to get Panama to rebel and get independence and deal with the US directly to avoid these new costs.