Answer:
Major industries were connected with petroleum refining, manufacturing of steel, and power generation sectors as well. The abundance in these areas was due to wide raw material availability of oil, timber, iron and steel.
Such industries were successful because of the demand they faced for such outputs of production.
Labor unions have been originated from the US, where they were formed to promote safe working conditions and security for the working population and is still in great practice changing millions of lives today.
They accomplished the trust that the working population don’t face the heat of the work they do, get their salaries in regard with the work they do and living their lives hassle free.