Well, technically, this is false. The Test Ban Treaty of 1963 prohibited nuclear weapons testing in the atmosphere, in outer space, and under water, but it didn't ban testing underground. However, it does prohibit nuclear explosions underground if they cause "radioactive debris" and contaminate the living surroundings.
The two main obstacles that United Sates mine workers faced were 1) Very dangerous conditions, in which many people lost their lives, and 2) A lack of good and reliable pay for their labor.
<span>For number1, he tried to keep it a secret, the word spread quickly, and triggered the California Gold Rush of 1849.</span>
One reason that Thomas Paine believes that the youth of the colonies is an advantage against Britain because their youth lends itself to vigor and unity and also they can entice creditors from overseas.