Why did the mormon trail of 1840 happen?

The Mormon pioneer run began in 1846, when Young and his followers were driven from Nauvoo. After leaving, they aimed to establish a new home for the church in the Great Basin and crossed Iowa. Along their way, some were assigned to establish settlements and to plant and harvest crops for later emigrants.

Explanation:

the intolerable acts were punitive laws passed by the british parliament in 1774 after the boston tea party. in great britain, these laws were referred to as the coercive acts.