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Reference.org
Common Core implementation by state
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<p>46 states initially adopted the <a href="/facts/Common_Core_State_Standards/KvL3jJ9R">Common Core State Standards</a>, although implementation has not been uniform. At least 12 states have introduced legislation to repeal the standards outright, and 5 have since withdrawn from the standards. </p><p>Among the territories of the United States, the U.S. Virgin Islands, Guam, the Northern Mariana Islands, and the American Samoa Islands have adopted the standards while Puerto Rico has not adopted the standards. </p>