What did President George W. Bush call the 9/11 attacks?

It’s hard to imagine an American leader authorizing the shoot-down of civilian aircraft. But in the first hour following the attacks of September 11, 2001, when it was unclear how many passenger jets had been weaponized by terrorists—and then aimed at America’s seats of power—that’s exactly what happened.

Explanation:

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain