I don’t think it was social democracy in India under Nehru. If I’m not mistaken, Nehru’s policies were further left than social democracy but I am willing to be corrected.

Edit: I forgot to mention, the Indian state of Kerala elects a socialist party since the independence of India, and have successfully uplifted the standards of living in its population with free housing and education etc, but people there are emigrating because there aren’t any jobs.