Answer:The process discussed in the excerpt, which is different from the earlier decision to participate in the Spanish-American War, is the shift in the United States' foreign policy from isolationism to interventionism. During the Spanish-American War, the United States' decision to participate was motivated by a desire to expand its territorial influence and assert its dominance in the Western Hemisphere. In contrast, during World War I, the United States initially adopted a policy of neutrality and was hesitant to become involved in the conflict.
However, the excerpt explains that the United States' policy of neutrality was ultimately unsustainable due to technological advancements in communication and transportation. The telegraph, railroads, and steamships made it easier for information to travel quickly across the ocean, erasing the distance between the United States and Europe. This made it increasingly difficult for the United States to remain neutral, as it became impossible to ignore the impact of the war on global politics and the economy.
As a result, the United States shifted its foreign policy from isolationism to interventionism, recognizing that it could no longer remain isolated from world affairs. This shift led to the United States' entry into World War I, as it recognized the importance of its role as a global power and the need to protect its interests and influence in the world.