Here is my proposal for 6 regions within the current national boundaries of Atlasia. I tried to even the population as much as possible.
Dark Green: The Pacific
Dark Red: The Southwest
Dark blue: The Northwest
Light green: The Deep South
Pink: The Mideast
Light blue: The Northeast
I know people will think.. "huh? Michigan in the Northwest?" At one point, Michigan was considered the northwest. It's why people usually call Washington part of the "Pacific Northwest" because states like the Dakotas and Minnesota were originally "The Northwest".
Oh no Gurl! Aint no way I'm going to part with Delaware!