Question

why did the mahatma Gandhi started civil disobedience movement with breaking the salt​

Answer 1

Answer:

On March 12, 1930, Indian independence leader Mohandas Gandhi begins a defiant march to the sea in protest of the British monopoly on salt, his boldest act of civil disobedience yet against British rule in India. ... Although India's poor suffered most under the tax, Indians required salt.

Answer 2

As we all know:

Britain’s Salt Act of 1882 prohibited Indians from collecting or selling salt, a staple in their diet.

Indian citizens were forced to buy the vital mineral from their British rulers, who, in addition to exercising a monopoly over the manufacture and sale of salt, also charged a heavy salt tax. Although India’s poor suffered most under the tax, all Indians required salt.

So:

Defying the Salt Act, Gandhi reasoned, would be an ingeniously simple way for many Indians to break British law nonviolently.

Gandhi declared resistance to British salt policies to be the unifying theme for his new campaign of “Satyagraha,” or mass civil disobedience