How did the Panama Canal Treaty of 1977 change control of the canal?

The Panama Canal Treaty of 1977 fundamentally transformed the control of the Panama Canal by ending the indefinite U.S. control established by the 1903 Hay–Bunau-Varilla Treaty and initiating a transition toward full Panamanian sovereignty.12

Key changes included:

• Gradual Transfer: The treaty provided for the phased transfer of canal operations, management, and maintenance to Panama, culminating in full control on December 31, 1999.31
• Abolition of the Canal Zone: The treaty abolished the Canal Zone, recognizing Panama as the territorial sovereign over those lands and waters.2
• Administrative Shift: The Panama Canal Commission was established to manage the canal during the transition, with a board consisting of both U.S. and Panamanian members. Leadership roles within the commission transitioned from U.S. nationals to Panamanians by 1990.12
• Military Phaseout: The agreement mandated the phaseout of U.S. military bases in the region.34
• Neutrality: A separate Neutrality Treaty ensured the canal would remain permanently neutral, open to vessels of all nations.12