Answer:
Steel was a necessary material for many new industries, such as the railroads, tool making, construction. Also, many industries were needed to support the steel industry, such as coal mining, and iron ore mining.
Explanation:
Generally speaking, a key development that occurred globally during the classical era was "<span>D. The expansion of cultural exchange through regional trade", since this was a time of cultural and technological diffusion. </span>
I believe the answer is: 1. Depreciating and 2. Fewer
When a currency depreciate, the purchasing power that the currency had toward imported product would decrease. When this happen, the the currency would be seen as less valuable by people from another country, which cause the price of the currency to be lower in foreign exchange market.
