* Noted differences are statistically significant at 5% level. The states whose bars are shaded grey had shares of proficient students that were not measurably different from the share of all US students scoring that that level or above. Proficiency is as measured by the NAEP main assessment.
Source: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP). Data accessed via the NAEP Data Explorer at https://nces.ed.gov/nationsreportcard/about/naeptools.aspx. Data presented by the American Academy of Arts and Sciences’ Humanities Indicators (www.humanitiesindicators.org).