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The flag of the state of South Dakota represents the U.S. state of South Dakota. It consists of a field of sky blue charged with a version (in navy blue on white) of the state seal in the center, surrounded by gold triangles representing the sun's rays, surrounded in turn by inscriptions in gold sans-serif capitals of "south dakota" on top and "the mount rushmore state" (the state nickname) on the bottom. The sun represents the common weather in South Dakota. The inscription on the bottom was "the sunshine state" before it was changed in 1992.

Source: Wikipedia