Let us not seek to satisfy our thirst for freedom by drinking from the cup of bitterness and hatred. We must forever conduct our struggle on the high plane of dignity and discipline. We must not allow our creative protest to degenerate into physical violence. Again and again, we must rise to the majestic heights of meeting physical force with soul force
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.
They became more of a fashionable item. most likely got more expensive so you'd only see the rich wearing shoes and it would show the social classes more easily so it might have made some people feel bad about themselfs. before they were only used to keep your feet from being burned from a hot ground or from getting frost bite in winter.
