History of the Panama Canal
During World War II, the canal proved a vital part of the U.S. military strategy, allowing ships to transfer easily between the Atlantic and Pacific. Politically, the Canal remained a territory of the United States until 1977, when the Torrijos–Carter Treaties began the process of transferring territorial control of the Panama Canal Zone to Panama, a process completed on 31 December 1999.
Panama
A project to build a third set of locks for the Panama Canal A was overwhelmingly approved in a referendum (with low voter turnout, however) on October 22, 2006. The official estimated cost of the project is US$5.25 billion, but the canal is of major economic importance because it provides millions of dollars of toll revenue to the national economy and provides massive employment. Transfer of control of the Canal to the Panamanian government completed in 1999, after 85 years of US control.