when was this album released?
9 March 1987
The Joshua Tree
 It was produced by Daniel Lanois and Brian Eno, and was released on 9 March 1987 on Island Records.
what was u2's lead single from 'the joshua tree' "With or Without You", "I Still Haven't Found What I'm Looking For"
wiki:11683103
The Joshua Tree [SEP] Introduction
The group supported the record with the Joshua Tree Tour throughout 1987, during which they began to perform in stadiums for the first time in their career.