who were the different social groups of people who flocked to the Gold Mines as industrial Society emerged

Gold miners.

Explanation:

Gold miners are people who search gold as industrial Society emerged because there is high demand and value of gold in the society and the more money should be made by the gold miners for selling of gold. different groups who had the knowledge about occurance and extraction of gold choose this field and earn a higher status in the society due to wealth gain from this gold.

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.