Why did Gandhi lead the Salt March? What did Gandhi achieve through the Salt March?

The Salt March, which took place from March to April 1930 in India, was an act of civil disobedience led by Mohandas Gandhi to protest British rule in India. During the march, thousands of Indians followed Gandhi from his religious retreat near Ahmedabad to the Arabian Sea coast, a distance of some 240 miles. The march resulted in the arrest of nearly 60,000 people, including Gandhi himself. India finally was granted its independence in 1947.

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the 24 day march lasted from 12 march 1930 as direct action campaign of tax resistance and nonviolent protests against the British salt monopoly after making the salt by evaporation at dandi, Gandhi continued southward along the coast, making salt and addressing meetings on the way

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.