Answer:
1) Mining
2) Ranching
3) Commercial Farming
Explanation:
The miners who comes mostly from California and other areas fulfilled the demand for gold and silver in the East. They also contributed in extracting other minerals i.e. copper, zinc, iron ore, lead, and quartz, which were great for the industrial use.
The sheep and cattle ranchers played an important role too i.e. that they produced wool, meat, and leather to satisfy the demands of eastern manufacturers and the consumers.
The farmers contributed by making farming commercial. They sold their crops in home town and internationally which helped the economy to improve.
