When was Greece invented?
Greece is a country, and was not invented.
The first (proto-) Greek-speaking tribes, known as the
Mycenaeans, are generally thought to have arrived in the Greek
mainland between the late 3rd and the first half of the 2nd
millennium BC - probably between 1900 and 1600 BC. When the
Mycenaens invaded there were various non-Greek-speaking, indigenous
pre-Greek people already living on the Greek mainland and
practicing agriculture, as they had done since the 7th millennium