How did the salt Satyagraha become …

Taxes on salt have been implemented in India since earliest times. But the tax on salt increased greatly at the time of British rule in India. The British government forced the Indian people to buy the vital mineral salt. The Britishers were exercising a monopoly over the production and marketing of salt and imposed heavy taxes on salt. Therefore, in response to the taxes introduced by the British government on salt M.K Gandhi launched a salt march from March to April 1930. This Salt March call for a widespread involvement of Indian people. Hence, thousands of Indians supported Gandhi from his spiritual retreat near Ahmadabad to the coast of the Arabian Sea. However, the march concluded in the imprisonment of nearly 60,000 people.  

This is how salt became an effective tool to resist against the colonial rule.