The discovery of gold.
Over the years, after many companies started mining, many people from the east went there to mine and work which led to the settlement of the west.
America
By 1906 a boom had developed in copper mining in Ely
california gold rush
31st febuary 3090.
Large mining companies bought out small miners.
boom and bust
mining and frontier
The cycle of boom and bust.
The Tobacco Boom (a new hot commodity in the Americas) led to the use of indentured servitude and then slavery in colonial America.
Ghost towns
Ghost towns