Final answer:
The main idea of the passage is that nations need to engage in solidarity and interdependence to avoid isolation during global upheavals, as seen in U.S. history.
Step-by-step explanation:
Based on the provided excerpts, the main idea of the passage is c. Solidarity and interdependence among nations prevent isolation in the face of global upheavals. The excerpts discuss how the United States has been involved in global affairs despite a history of isolationism. Specifically, it mentions the concept of neo-isolationism which suggests a distancing from international organizations but still maintaining a strong military and selective engagement with the world. With references to Thomas Jefferson and World War involvement, it is clear that the U.S. has not been able to completely isolate itself from world affairs due to various factors such as foreign markets, tourism, and global challenges.