Final answer:
The September 11 attacks in 1998 prompted the United States to change its foreign policy to one of intervention, leading to wars in Afghanistan and Iraq.
Step-by-step explanation:
United States foreign policy encompasses diplomatic, economic, and military strategies to safeguard national interests and promote global stability. It evolves based on geopolitical challenges, alliances, and international relations. Core principles include democracy promotion, human rights advocacy, and addressing global issues.
In 1998, the event that ultimately led the United States to change its foreign policy to one of intervention was the September 11 attacks by the terrorist group al-Qaeda. These attacks prompted the United States to begin wars in Afghanistan and Iraq, which marked a significant shift in its approach to global affairs. The mistakes made in Iraq damaged the reputation of the United States and weakened its ability to preserve stability in the world.