According to bede, what factor is most important in uniting people and giving them a common identity?

The answer for this question is: Common language

In order to make people unite, we need to make those people go after the same goal or principle.
And in order to achieve that, the one most important thing that we really need is a way to communicate with those people. Common language will make communication a lot easier so we can align our perception with other people.

It allowed for things to be produced much more quickly and efficiently