In 1957, Kerala made history by becoming the first state in the world to elect a communist government through a democratic election process. This historical milestone was achieved when the Communist Party of India (CPI) emerged victorious in the state assembly elections held in March 1957. Under the leadership of E. M. S. Namboodiripad, who became the Chief Minister, the CPI formed the government. This event was significant as it demonstrated the successful functioning of democratic principles in electing a government with a communist ideology, a rare occurrence globally and a unique one for India.
Therefore, the correct option is: Kerala.
Kerala made history in 1957 by becoming the first state in the world to have a democratically elected communist government. This was a significant political event, as the Communist Party of India (CPI) won the legislative assembly elections, and E. M. S. Namboodiripad became the first communist Chief Minister of the state.