[Governor Dinwiddie]

It was the mysterious "Sea People".

[Harmless Teddy Bear]

It is possible the Sea People were on the move because it was getting colder and/or drier where they were.

I seem to recall that one of the places they recorded something like 11 years of drought.

No civilization could have survived that.

A year? No problem.

Two? Ok.

Three? You are getting skinny.

Four? Time to go.