What was the world called before the countries all split apart?

I'm not clear on your question, but it was called Pangea before it split.

The super continent PangeaAbout 180 million year ago there was only one continent called Pangea, that began to break up into separate continents. Over time as the land masses moved apart it formed the continents we know today. They are still moving.

There were no countries 180 million years ago. Countries are boundaries, as man divided the land into separate territory.