From 9/11’s ashes, a new world took shape. It did not last.

Activists of Pakistan militant religious parties stand with a banner which reads, “Americans, think why you are hated all over the world,” during a rally in Islamabad, Pakistan Sept. 15, 2001, to condemn possible U.S. attacks on neighboring Afghanistan. (AP Photo/B.K. Bangash, File)

FILE - In this March 11, 2004 file photo, rescue workers cover bodies alongside a bomb-damaged passenger train, following a number of explosions in Madrid, Spain, which killed more than 170 rush-hour commuters and wounded more than 500 in Spain's worst terrorist attack ever. An Al-Qaida-linked group that claimed responsibility for the Madrid train bombings warned European nations that they have only two weeks to withdraw troops from Iraq or face the consequences, a pan-Arab newspaper reported Friday, July 2, 2004. (AP Photo/Paul White, File)

Liberty County resident M. Timonthy Elder, Sr. repositions one of his wind-blown U.S. flags Sept. 13, 2001, in Bristol, Fla. (AP Photo/Phil Coale, File)

A member of the St. Louis County Police Department points his weapon in the direction of a group of protesters Aug. 13, 2014, in Ferguson, Mo. (AP Photo/Jeff Roberson, File)

Iraqi civilians and U.S. soldiers pull down a statue of Saddam Hussein in downtown Baghdad, in this April 9, 2003 file photo. The U.S. invaded Iraq on false claims that Hussein was hiding weapons of mass destruction. (AP Photo/Jerome Delay, File)

U.S. Marines from the 24th Marine Expeditionary Unit try to take shelter from a sand storm at forward operating base Dwyer in the Helmand province of southern Afghanistan on May 7, 2008. (AP Photo/David Guttenfelder, File)

In the ghastly rubble of ground zero’s fallen towers 20 years ago, Hour Zero arrived, a chance to start anew.