The answer to this problem is true. The nation makes most of their money through the export of oil.
Answer:
Bessemer had been trying to reduce the cost of steel-making for military ordnance, and developed his system for blowing air through molten pig iron to remove the impurities. ... This made steel easier, quicker and cheaper to manufacture, and revolutionized structural engineering.
Explanation:
The main cause of the second industrial revolution was, natural resources, abundant labor supply, strong government policy and new sources of power.