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Dating back to 1910, the route US 6 follows was originally the Great White Way and River-to-River Road. Highway System was created in 1926, the highway was designated U. As the Interstate Highway System expanded in the 1950-1970s, US 6's importance as a cross-state route was diminished by I-80.
North of Atlantic, the highway overlaps Interstate 80 (I-80) until De Soto.
From there, it travels east through Oakland and Atlantic.