Conversation so far:
who was the founder of buddhism and when was it founded
Buddhism was founded in the late 6th century B.C.E. by Siddhartha Gautama.
where was buddhism founded
Buddhism arose in the eastern part of Ancient India, in and around the ancient Kingdom of Magadha (now in Bihar, India).
how many buddhists are there
Buddhism is a religion practiced by an estimated 535 million people as of the 2010s.

Question: what countries have the largest populations
Self-contained rewrite: what countries have the largest populations of buddhists