Final answer:
In the 1880s, the French began construction of a canal in Panama but failed due to corruption and disease. President Roosevelt capitalized on this failure, supporting a Panamanian revolution and securing a treaty that allowed the U.S. to finish the Panama Canal, cutting down global shipping costs.
Step-by-step explanation:
The attempts by the French to build a canal in Panama during the 1880s were hampered by corruption and disease, leading to the eventual abandonment of their project after completing only a fraction of the canal. Seizing on this stalled endeavor, President Theodore Roosevelt was quick to take action, ultimately facilitating a revolution in Panama to secure the rights for the United States to continue the canal's construction.
By helping Panama gain independence from Colombia and then negotiating the Hay-Bunau-Varilla Treaty, the U.S. gained control of the Canal Zone. The Panama Canal was completed under U.S. leadership and significantly reduced global shipping costs by providing a shortcut between the Atlantic and Pacific Oceans.