Instruct: Given a question, retrieve relevant documents that can help answer the question.
Query: When did construction on the Panama Canal begin?
France began work on the canal in 1881, but stopped due to engineering problems and a high worker mortality rate. The United States took over the project in 1904 and opened the canal on August 15, 1914. One of the largest and most difficult engineering projects ever undertaken, the Panama Canal shortcut greatly reduced the time for ships to travel between the Atlantic and Pacific Oceans, enabling them to avoid the lengthy, hazardous Cape Horn route around the southernmost tip of South America via the Drake Passage or Strait of Magellan.
Bunau-Varilla vociferously promoted construction of the canal. With aid from the New Panama Canal Company's New York attorney, William Nelson Cromwell, he persuaded the government to select Panama as the canal site, as opposed to the popular alternative, Nicaragua. When opponents voiced their interest in constructing a canal through Nicaragua, which was a less politically volatile nation, Bunau-Varilla actively lobbied in the United States, for example by distributing Nicaraguan postage stamps featuring belching volcanos to senators. Through lobbying of businessmen, government officials, and the American public, Bunau-Varilla convinced the U.S. Senate to appropriate $40 million to the New Panama Canal Company, under the Spooner Act of 1902. The funds were contingent on negotiating a treaty with Colombia to provide land for the canal in its territory of Panama.
By the late nineteenth century, technological advances and commercial pressure allowed construction to begin in earnest. Noted canal engineer Ferdinand de Lesseps led an initial attempt by France to build a sea-level canal. Beset by cost overruns due to the severe underestimation of the difficulties in excavating the rugged Panama land, heavy personnel losses in Panama due to tropical diseases, and political corruption in France surrounding the financing of the massive project, the project succeeded in only partially completing the canal. 
During the construction of the Panama canal, the initial attempts by France to construct a sea-level canal across the isthmus were secured through treaty with Colombia; however French cost overruns and corruption in the Panama scandals led to abandonment of the Canal for a decade. During the intervening years, local separatists used the political instability of the Thousand Days' War to agitate for political separation from Colombia and establishment of an independent republic. When the United States sought to take over the canal project, the government of Colombia proved difficult to work with, and with the cooperation of French financier Philippe-Jean Bunau-Varilla, Panama simultaneously declared independence from Colombia and negotiated a treaty granting the U.S. the right to construct the canal.
The Panama Canal locks () are a lock system that lifts a ship up to the main elevation of the Panama Canal and down again. The original canal had a total of six steps (three up, three down) for a ship's passage. The total length of the lock structures, including the approach walls, is over . The locks were one of the greatest engineering works ever to be undertaken when they opened in 1914. No other concrete construction of comparable size was undertaken until the Hoover Dam, in the 1930s.
Through the 1903 separation of Panama from Colombia and the Hay-Bunau-Varilla Treaty, the United States had secured rights to build a canal in the Isthmus of Panama. Legislation authorizing construction did not specify which government department would be responsible, and Roosevelt designated the Department of War. Taft journeyed to Panama in 1904, viewing the canal site and meeting with Panamanian officials. The Isthmian Canal Commission had trouble keeping a chief engineer, and when in February 1907 John D. Stevens submitted his resignation, Taft recommended an army engineer, George W. Goethals. Under Goethals, the project moved ahead smoothly.
The United Electric Tramway line started service just as the first major attempt to build a canal across the isthmus by the Ferdinand de Lesseps-led "Société internationale du Canal interocéanique" was winding down. By 1894, a second effort to build a canal under a newly formed "Compagnie Nouvelle du Canal de Panama" was started. The construction efforts helped boost ridership along the new tramway line. The second canal construction attempt did not succeed, and the economy of the isthmus slowed. Service along that first Panama City tramway line ended during the Thousand Days' War, which lasted from 1899 to 1902.
By the time the United States took control of the Panama Canal project on May 4, 1904, the Isthmus of Panama was notorious for tropical diseases. An estimated 12,000 workers had died during the construction of the Panama Railway and over 22,000 during the French effort to build a canal. Many of these deaths were due to disease, particularly yellow fever and malaria. At several times, construction on the Panama Railway had actually halted due to the lack of healthy workers.
The Panama Railway also operated a significant shipping line, connecting its service with New York and San Francisco. It ran a Central American line of steamships linking Nicaragua, Costa Rica, San Salvador, and Guatemala to Panama City. The shipping service was greatly expanded when canal construction began. Ships included the SS "Salvador", SS "Guatemala", SS "Cristobel", and , which became the first of the ships to cross the completed canal in 1914.
In 1904 the United States took over the license to build and operate the canal. The choice to use locks and an artificial lake (Gatun) meant that the old railway route from 1855 had to be changed because it followed the Chagres River valley, which would be flooded by the lake. Also, the railway would be extended and altered continuously for the building process. The stock of the Panama Railway Company, vital in canal construction, was entirely controlled by the United States Secretary of War.
The development in this once unincorporated part of Northwest Florida had previous names such as Floriopolis, Park Resort, and Harrison. In 1906, the development was named Panama City and it was first incorporated as Panama City in 1909. According to the Panama City Public Library's "A History of Panama City", George Mortimer West hoped to spur real estate development in Bay County during a period of intense popular interest in the construction of the Panama Canal by changing the town's name from Harrison to Panama City, because a straight line between Chicago and the capital of the Central American country of Panama intersected the Florida town. Additionally, since required meanders around land formations in a seaborne route to the canal added distance when starting at other ports, Panama City was the closest developed port in the US mainland to the Caribbean entrance of the Panama Canal.
The United States took control of the French property connected to the canal on May 4, 1904, when Lieutenant Jatara Oneel of the United States Army was presented with the keys during a small ceremony. The new Panama Canal Zone Control was overseen by the Isthmian Canal Commission (ICC) during construction.
After the Panama Canal Company went bankrupt in 1888 amidst charges of fraud, Bunau-Varilla was left stranded in Panama. He struggled to find a new way to construct the canal. When the New Panama Canal Company sprang up back in his native France, Bunau-Varilla sailed home, having purchased a large amount of stock. However, as de Lesseps' company had before, the New Panama Canal Company soon abandoned efforts to build the canal. It sold the land in Panama to the United States, in hopes that the company would not fail entirely. U.S. President Grover Cleveland, an anti-imperialist, avoided the canal issue. When the more supportive Theodore Roosevelt became president (succeeding William McKinley), canal planning resumed in the United States.
Ten years after construction was complete, this arrangement was becoming unacceptable to the Panamanians and they insisted that the United States give to Panama all the Canal Zone property they had purchased, ownership and control of the canal, ports, water supply, etcetera, and to submit the Canal Zone to Panamanian governance. By 1963, President Eisenhower had compromised by giving land to Panama, raising the annual tolls paid to Panama up to more that 2 million dollars annually, and with a plan to allow the flag of Panama to be flown beside the Stars and Stripes outside public buildings. This measure had not been fully enacted, when President Kennedy was assassinated. In Panama, there were demonstrations by Panamanian, often involving the desecration of United States flags.
"Havana" was sold to the Panama Railroad Steamship Company on behalf of the Isthmian Canal Commission in 1905. She was renamed "SS Panama" and would serve a crucial role in the construction of the Panama Canal. The steamship company was already running connecting service with New York and San Francisco. It also ran a Central American line of steamships linking Nicaragua, Costa Rica, San Salvador, and Guatemala to Panama City. The shipping service was greatly expanded as canal construction began. The line's heyday was during the construction period; once the canal was finished in 1914 the service shifted to the business of supporting the maintenance and operation of the canal and its supporting infrastructure, including the railroad.
In 1903, the U.S. aided the secession of Panama from the Republic of Colombia. The secession was engineered by a Panamanian faction backed by the Panama Canal Company, a French–US corporation whose aim was the construction of a waterway across the Isthmus of Panama thus connecting the Atlantic and Pacific Oceans. In 1903, the U.S. signed the Hay-Herrán Treaty with Colombia, granting the United States use of the Isthmus of Panama in exchange for financial compensation. amidst the Thousand Days' War. The Panama Canal was already under construction, and the Panama Canal Zone was carved out and placed under United States sovereignty. The US did not transfer the zone back to Panama until 2000.
The Panama Canal Museum () is a non-profit and public museum located in Panama City, Panama. Established in 1997, the museum is devoted to the history of the construction of the Panama Canal in its various stages, including the first French construction attempt, the later construction by the United States, and the eventual transfer to Panamanian control. The current building dates from 1874 and served originally as the headquarters of both the French and U.S. companies engaged in the construction of the canal. It is located in the city's old quarter.
The Panama Canal Railway () is a railway line linking the Atlantic Ocean to the Pacific Ocean in Central America. The route stretches across the Isthmus of Panama from Colón (Atlantic) to Balboa (Pacific, near Panama City). Because of the difficult physical conditions of the route and state of technology, the construction was renowned as an international engineering achievement, one that cost US$8 million and the lives of an estimated 5,000 to 10,000 workers. Opened in 1855, the railway preceded the Panama Canal by half a century; the ship canal was later constructed parallel to the railway.
By 1940, the United States had a strong presence in Central America, especially in Panama. The American-owned and operated both the Panama Canal and the Panama Railroad, but with the looming war in Europe, the United States felt it necessary to establish a more direct connection with Panama. Therefore, the American and Panamanian governments agreed to begin the construction of a trans-isthmian highway located outside of the Canal Zone. Thus, the construction of the actual Inter-American Highway was instigated by the United States as a safety precaution at the beginning of World War II. 
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.
Hallen was born in Atlanta, Georgia, in 1875. After spending six years in Puerto Rico and two years in Cuba, he was appointed as the official photographer of the Panama Canal by the Isthmian Canal Commission in 1907. Hallen was contracted to capture “… a series of photographs… about once a month… to show construction progress” to satisfy both Washington and the American public. In addition to showing the construction and progress of the Panama Canal, Hallen depicted the day-to-day life of the “Zonians” – Americans living in the Panama Canal Zone - and its development over the course of the years. Throughout his 30-year career, Hallen produced between 12,000 and 16,000 images, each with a “strangely satisfying aesthetic experience” portraying life in the Panama Canal Zone. For his service to the Panama Canal Zone and as an employee of the Isthmian Canal Commission, Hallen was awarded the Roosevelt Medal with two bars.
A canal system had been planned in Eagle Pass since 1885, when rancher Patrick W. Thompson drew up plans for an irrigation canal network. Construction on the project commenced in 1889. Progress was stopped due to a lack of funding after only three miles of canal were built. Construction on the project did not begin again until 1926, when Capt. W. A. Fitch pushed for construction. The canal began operation in 1932, and in the early 1970s, the main canal ran . Onions and figs were among the first crops grown here.
During the 16th century, the prospect of a canal was renewed. In 1531, Charles V authorized the construction of a canal linking Charleroi and Willebroek, though work did not begin immediately. It was not until 1550 that Mary of Habsburg, Governor of the Netherlands, finally ordered work to begin. When work was finished in 1561, the canal linked Brussels to the Scheldt at Willebroek, though it did not continue south past Brussels.
Secretary of State Hay and French diplomat Philippe-Jean Bunau-Varilla, who represented the Panamanian government, quickly negotiated the Hay–Bunau-Varilla Treaty. Signed on November 18, 1903, it established the Panama Canal Zone—over which the United States would exercise sovereignty—and insured the construction of an Atlantic to Pacific ship canal across the Isthmus of Panama. Panama sold the Canal Zone (consisting of the Panama Canal and an area generally extending on each side of the centerline) to the United States for $10 million and a steadily increasing yearly sum. In February 1904, Roosevelt won Senate ratification of the treaty in a 66-to-14 vote. The Isthmian Canal Commission, supervised by Secretary of War Taft, was established to govern the zone and oversee the construction of the canal. Roosevelt appointed George Whitefield Davis as the first governor of the Panama Canal Zone and John Findley Wallace as the Chief Engineer of the canal project. When Wallace resigned in 1905, Roosevelt appointed John Frank Stevens, who built a railroad in the canal zone and initiated the construction of a lock canal. Stevens was replaced in 1907 by George Washington Goethals, who saw construction through to its completion. Roosevelt traveled to Panama in November 1906 to inspect progress on the canal, becoming the first sitting president to travel outside of the United States.
The Panama Canal Authority () is the agency of the government of Panama responsible for the operation and management of the Panama Canal. The ACP took over the administration of the canal from the Panama Canal Commission, the joint US–Panama agency that managed the canal, on December 31, 1999, when the canal was handed over from the United States to Panama as per the Torrijos–Carter Treaties.
The Isthmian Canal Commission and the Panama Canal Guard of 1904–1914 both played a pivotal role in the construction and early defense of the Canal. With the active support and encouragement of the United States, Panama declared its independence from Colombia on 3 Nov. 1903 and that same month, the United States received the right to build and administer the Panama Canal.