The Invasion of Panama The U.S. invasion of Panama on December 20, 1989 was a mark of excellence on the behalf of the U.S. armed forces ability to effectively use the principles of war. The years leading up to the invasion set the climate for conflict; drug trafficking became a major problem between Panama and the U.S. in the 1980's, as well as Manuel Noriega's interference with the Panama canal employees rights under the Panama Canal Treaty; the final action that sparked the invasion was Noriega's attempt to fix the national election and the military enforcement of the fix after the election. Once this took place the U.S. began to make a plan for the invasion. The overwhelming s