[well1912]

If you consider water to be included in the four colors, then connecting the upper and lower peninsulas through the water does nothing but move the problem between the Michigan segments to be a problem between the water segments.

If you connect Michigan between the water and the land, then you'll have to account for the fact that the water on one side and land on the other can be colored the same during the connection but _can't_ after the connection is erased.

[martinjacobd]

Okay I see what you're saying. I was considering water as a hole in the map not a color, but that does make sense.