Guarda su Altadefinizione. 9/11 marked a new era in global terrorism, and a "War on Terror" was launched by the US. Since then, trillions have been spent on conventional warfare, counter-terrorism, secret intelligence, homeland security, cyberdefence and more, in pursuit of a sometimes indefinable enemy. We look at the costs and impact of this effort. Is there less terrorism today than before the war started? Is our world any safer?