B. Biosphere (not too sure)
Answer:
wildcatters
Explanation:
They were called wildcatters
That statement is true.
To be precise, the united states coined both gold and silver in 1873. Before this, gold is the only material that is used to create coin money.
But the cost of production to produce gold coin is really high. Because of this, the government decided to include silver in order to drive the cost of production down in 1973.
The reason why is England is about 3,000 miles away so it was tough to get supplies etc. to the colonists.
