What do the colors on this map mean?

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And keep on scrollin’. . . .

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Solution:

Of the other 49 states in the USA, how many are adjacent to this one? The answer to this question determines the color of each state.

One point of clarification: if it takes a lengthy trip by boat or ship to get there, I didn’t count it as an adjacent state . . . so, for example, Minnesota and Michigan didn’t make each other’s lists. Simply going over a bridge isn’t enough for this sort of separation, though, which is why Arkansas and Tennessee did make each others’ lists of adjacent states. Had I interpreted water borders differently, this map would have some differences.

Another way this map could be altered would be to count states that meet others only at a single point, rather than a border with non-zero length. This would change the colors of the “four corners” states of Arizona, Utah, New Mexico, and Colorado, but would have no effect on the other 46 states.