What religion did the indigenous peoples of Southeast Asia practice before the arrival of religions from elsewhere?

Question

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The indigenous peoples of Southeast Asia practiced animism, a belief that all living and non-living things possess a spirit or soul. This belief is still present among some indigenous communities in the region today. The arrival of external religions such as Buddhism, Hinduism, Islam, and Christianity eventually led to the adoption of these belief systems by some in Southeast Asia.

What Religion Did the Indigenous Peoples of Southeast Asia Practice