Al-qaeda’s main targets on september 11, 2001, were

The Twin Towers.

Also, to scare people, for them to know that Al-Qada exists.

by improved communication.

president thomas jefferson hoped that the embargo act of 1807 would the united states by demonstrating to britain and france their dependence on american goods, convincing them to respect american neutrality and stop impressing american seamen. instead, the act had a devastating effect on american trade.