Which military conflict occurred after the September 11, 2001 attacks?

The War on Terror is the military conflict that occurred in response to the September 11, 2001 attacks. Following these attacks, which were perpetrated by the terrorist group al-Qaeda, the United States launched a series of military operations aimed primarily at dismantling terrorist organizations and preventing further attacks. This includes the invasion of Afghanistan in 2001, where the Taliban regime, which had harbored al-Qaeda, was overthrown. The War on Terror has encompassed various military actions and operations in multiple countries, highlighting the global scope of the U.S. response to terrorism.

The other conflicts listed occurred at different times in history. The Korean War took place from 1950 to 1953, the Gulf War occurred in 1990-1991, and the Vietnam War spanned from the mid-1950s until 1975. None of these conflicts were initiated as a direct response to the events of September 11, 2001, making the War on Terror the only relevant choice in this context.