Explanation:

• Champaran, is a district in the state of Bihar in which under colonial era laws, many tenant farmers were forced to grow some indigo on a portion of their land as a condition of their tenancy.
• This indigo was used to make a dye. The Germans had invented a cheaper artificial dye so the demand for indigo fell.
• Some tenants paid more rent in return for being let off having to grow indigo.
• However, during the First World War the German dye ceased to be available and so indigo became profitable again. Thus many tenants were once again forced to grow it on a portion of their land- as was required by their lease. Naturally, this created much anger and resentment.
• 2017 is the 100th anniversary of Champaran Satyagraha, India's first civil disobedience agitation.