Why was the Non-Cooperation Movement started in 1920 and why was the movement called off in 1922?

The non-cooperation movement was launched in 1920 with the aim of obtaining self-governance and ultimately getting the British colonial authorities to grant full independence to India.

The movement was called off following the Chauri Chaura incident in February 1922 when a protest turned violent and led to the death of several policemen.

Mahatma Gandhi, who was against any form of violence decided to call off the non-cooperation movement indefinitely.

For further reading check the following articles:

• Non-cooperation movement
• Independence Struggle
• Chauri Chaura incident (Feb 4, 1922)