Final answer:
The US was able to build the Panama Canal in 1903 due to factors such as the US helping engineer the independence of Panama and buying the French canal company's land. Construction began in 1904, and the completion of the canal in 1914 significantly impacted global trade and military defense patterns. Efforts were also made to combat tropical diseases during construction.
Step-by-step explanation:
In 1903, the United States was able to build the Panama Canal because of multiple factors. One key factor was the Colombian government's delay in approving an agreement to hand over the canal zone and other rights to the US, leading to the US helping engineer the independence of Panama. The US provided military aid to ensure the success of Panama's revolution, which secured its independence and allowed the US to begin construction on the canal in 1904.
Another important factor was the US government buying the French canal company's land in 1902, which had been previously working on the canal project. The French project had faced difficulties with digging and had been abandoned. US engineers completed the construction of the canal in 1914, shortening the shipping distance between the Pacific and Atlantic Oceans and dramatically impacting world trade and military defense patterns.
The US also played a crucial role in combating tropical diseases like malaria and yellow fever during the construction of the canal. Dr. William Gorgas, with the help of Cuban researchers, made connections between mosquitoes and diseases and implemented measures to control their spread, reducing the death rate among workers.