Free U.S. State OpenStreetMaps ArcGIS Shapefile Map Layers is one of free gis data source that have fairly complete collection. One of them is U.S. State OpenStreetMaps ArcGIS Shapefile Map Layers. These ArcGIS shapefiles are extracted from CloudMade data, derived from OpenStreetMap and are licensed under the terms of the Creative Commons Attribution Share-Alike 2.0 license. About Quality, Accuracy and Suitability, they said:

The geodata, maps and shapefiles found on the website may come from a variety of government and private sources. While we try to assure the accuracy of this material, we cannot promise that it is absolutely accurate. We do promise that using this will be fun, entertaining or educational. Beyond this, we make no guarantee as to its suitability for any purpose. We assume no liability or responsibility for errors or inaccuracies. Please understand that you use this at your own risk

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