In which state are religious ideas about the transmigration of souls most widespread?

The doctrine of reincarnation is most widespread in India. In ancient Greece, this was called metempsychosis. Migration of souls was originally associated with totemism, but as religious and philosophical teachings developed, it penetrated all regions from the Celts and Greeks to the Hindus and Shintoists of Japan. The Eastern teaching on the transmigration of souls is the most widespread. It developed in the early teachings of the Buddha and his followers. It indicated that samsara corresponds to a person’s karma. For the first time, reincarnation is mentioned in the Indian Vedas.