Since the late 19th century, it's been standard in English to use U.S. state names as adjectives unmodified. In part that's because many states have rather stra

Since the late 19th century, it's been standard in English to use U.S. state names as adjectives unmodified. In part that's because many states have rather strange adjectival forms, or no good ones at all. For example, "the Michigan ideology" would be almost universally preferred over "the Michigander ideology", except perhaps in some hyperlocal writing. But even adjectival forms previously in use, like "Californian" and "Texan" (or the even older "Texian") fell largely out of use a century ago, in favor of the adjective following the noun form. For example, according to Google's ngram stats, "Texas law" and "Texas legislature" overtook "Texan law" and "Texan legislature" somewhere around 1890, and have been orders of magnitude more common in recent decades.