Buddhism began in India. It is now mostly practised in China.
Buddhism was originated in India. It is a south Asian country
Buddha was born in Lumbini in Nepal but taught Buddhism for the first time in Sarnath near Varanasi in India; either of these might be taken as the place where Buddhism started in the current era.
Historians have differing opinions on the precise date of the Buddha's birth but it was around the year 500BCE. He was born into a noble family in Lumbini, an area that today lies in the South of Nepal.
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Buddhism began in India thousands of years ago. It has now spread to nearly every country on earth.
India.
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Buddhism first started in the country of India.
Buddhism is least evident in the country of India.
Buddhism is the most dominate in China.
As Buddhism is in essence the wish or choice to engage with the laws of cause and effect it can never be eliminated. Assuming their was a country with no Buddhists it doesn't preclude that people may begin at any time to follow Buddhist teachings.