"what significant industries, including agriculture, developed in the west, and how were they linked to the economy of the eastern united states"

The main industry that developed in the West frontier, was mainly mining industry. In the agricultural sector cattle became a major activity and trade,because there was enough land for ranching activities. Important minerals that were sourced from the western frontier are coal,copper,oil and Gold.

Word of mouth.

False : "the strike began on september 8, 1965"