Final answer:
The United States experienced several changes in response to terrorism, including the creation of government agencies and the implementation of federal policies. Public opinion shifted, and military campaigns were launched as part of the War on Terror.
Step-by-step explanation:
After the 9/11 attacks, the United States underwent various changes in response to terrorism. The government created the Department of Homeland Security and the Transportation Security Administration to centralize disaster response and airport security. Additionally, federal policies such as the Faith-Based Initiative, No Child Left Behind, and the Affordable Care Act were implemented. Public opinion shifted, with increased trust in the government and a willingness to limit liberties for certain groups. The attacks also led to military campaigns in Afghanistan and Iraq as part of the War on Terror.