Washington, Sept. 10 -- The September 11, 2001, attacks changed US foreign policy, intelligence, and counterterrorism forever.

One of the key changes in US foreign policy is a shift to counterterrorism. The US prioritised counterterrorism, launching the Global War on Terrorism, with military interventions in Afghanistan and Iraq.

Three days after the gruesome attack, President George W. Bush visited the World Trade Centre site to speak to rescue workers. Later, at the Washington National Cathedral, he promised to "answer these attacks, and rid the world of evil."

He declared a national state of emergency, giving him more power to use the military. A week later, a second emergency declaration allowed the government to target terrorist f...