In the early 20th century, the United States pursued a policy of imperialism, which was often justified by the belief in Manifest Destiny and the need for economic expansion. One of the leading figures during this time was President Theodore Roosevelt, whose administration sought to position the U.S. as a dominant global power. One significant event that showcased this imperialistic approach was the construction of the Panama Canal. Which reason best explains the motivation behind the United States' actions in Panama?