How did the stock market crash of 1929 start

The stock market crash of 1929 was the result of heavy borrowing by consumer investors. The roaring 20's defined a period of time in which the market and the economy grew at a rapid rate. When the stock market corrected down, most of the investors who had margin loans were caught by surprise. This "margin squeeze" became the beginning of the end.

1. where does the energy of a nuclear power plant come from?

d) political bosses should not hold office

the anwser is a) to prevent military conflict