How did the attitudes of many Americans change after the terrorist attacks of September 11, 2001?
A wave of Islamophobia and foreign intervention abroad was well accepted after that tragedy
The 9/11 attacks triggered a tremendous wave of Islamophobia in the USA, a country wich has never had any significant muslim minority unlike many European nations.
The war in Afghanistan and then in Iraq was well accepted by the population as a sort of retaliation and a necessity in the war against Terror. Bush had been elected on an Isolationist stance but resorted to military interventionism instead after 9/11.