United States territorial acquisitions
The Panama Canal Zone was an unorganized US territory located within the Republic of Panama. It was established under the Hay–Bunau-Varilla Treaty in 1903 and disestablished in 1979 under the Torrijos–Carter Treaties. Panama gained full control over the Panama Canal in 1999.
Atlantic Bridge, Panama
The third bridge over the Panama Canal, known as the Atlantic Bridge, is a road bridge under construction in Colón, Panama, which will span the Atlantic entrance to the Canal. When completed it will be the third bridge over the Panama Canal after the Bridge of the Americas and the Centennial Bridge, both on the Pacific side of the canal.