It is useful so that way people understand what happened years ago.
Gandhi took the religious principle of ahimsa which means doing no harm, common to Buddhism, Hinduism and Jainism and turned it into a non-violent tool for mass action. He used it to fight not only colonial rule but social evils such as racial discrimination and untouchability as well.
Answer: Stock Market Crash of 1929 signaled the great depression. This was a quick decline in stock values.
