Answer:
It allowed them to make musical instruments.
Explanation:
Metallurgy was the study of Metallic elements. It help people learn the way to use metals to form various forms of tools that will be beneficial for them. These includes musical instruments.
Many if the musical instruments at the time was made with the combination of woods and iron/bronze. Most of the metals were used as coating to make sure that the physical structure of the musical instruments are not easy to break.
There was no authority because alto of people didn't like them. they were the leaders of there group
Even though Harding, Coolidge, and Hoover were all presidents elected to office for the Republicans, Hoover wasn´t really a conservative.
As the economy suffered due to the infamous stock market crash of 1929, Hoover explored non-conservative policies that his predecessors wouldn´t support. He expanded public works, signed into law the high peacetime tax increase and signed a tariff that would end up hurting foreign trade.