The United States’ "war on terror" was a multifaceted effort to prevent the spread of terrorist ideologies and activities. Framed by President George W. Bush and his administration as an attempt to destroy both state-specific and international terrorist groups such as al-Qaeda, Hamas, and Hezbollah, the war on terror mostly took the form of extended military operations, especially in Iraq and Afghanistan. It also included intelligence operations throughout the world, as well as domestic intelligence gathering. Like the "war on drugs" and the "war on poverty," the war on terror has been considered an ideological war; however, unlike other ideological wars, the war on terror includes active military operations. While President Barack Obama declared the official end of the global war on terror framework in 2013, ongoing conflicts and operations continued to focus on antiterrorism.
QUESTION: What are the causes and/or effects of the War on Terror?