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.
Well he is basically letting serial killers go off onto the streets and into everyday peoples lives. They will involve themselves with people and eventually kill or cause harm to people again. They wont learn from there mistakes if they dont get punished for them.
Answer:
I believe it's the Treaty of Echota
China is the right answer