One factor was barbed wire. As farmers and ranchers wisened up, they used the wire to fence in their cattle, destroying the use of cowboys, and taking away one aspect of the "wide open west". Herds of cattle took over the plains and destroyed the grass. In 1883 the big drought struck and water streams dried up and prairie fires grazed. Also the barbed wire and the natural disasters.
Student nonviolent coordinating committee or SNCC
One reason why English immigration to the colonies dropped dramatically after 1660 was because "<span>c. The English economy improved and political and religious conflict diminished," since this had been a major motivation for much of the colonial emigration leading up to this point. </span>
The United States Supreme Court case that resulted in a unanimous decision against President Richard Nixon, ordering him to deliver tape recordings and other materials to the court