Colorado is most rectangular state in the union, with all four of its borders being perfectly straight, according to the results of the 2012 Gallup-Healthways State-border-straightness Index released on Wednesday. For the 123rd year running, Wyoming was declared the squarest state.
West Virginia has the wiggliest borders, all of which follow rivers, contour lines or other natural features. Straight borders were found across most of the states west of the Mississippi River, with the Deep South states sharing one long straight border to separate them from the more civilized states in the north east and New England.
The national border-straightness index is 86.2 per cent. It was 83.1 per cent prior to Hawaii being granted statehood in 1959, since when the rate has remained constant.
Key:
Pale yellow = rectangular
Dark green = wiggly borders
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