CRS Report – Common Core State Standards: Frequently Asked Questions. Rebecca R. Skinner, Specialist in Education Policy; Jody Feder, Legislative Attorney. September 15, 2014.

“Over the last two decades, there has been interest in developing federal policies that focus on  student outcomes in elementary and secondary education. Perhaps most prominently, the enactment of the No Child Left Behind Act of 2001 (NCLB; P.L. 107-110), which amended and reauthorized the Elementary and Secondary Education Act (ESEA), marked a dramatic expansion of the federal government’s role in supporting standards-based instruction and test-based accountability, thereby increasing the federal government’s involvement in decisions that directly affect teaching and learning. Under the ESEA, states are required to have standards in reading and mathematics for specified grade levels in order to receive funding under Title I-A of the ESEA. In response to this requirement, all 50 states and the District of Columbia have adopted and implemented standards that meet the requirements of the ESEA. Since the ESEA was last comprehensively reauthorized by NCLB, recent developments have taken place that have possibly played a role in the selection of reading and mathematics standards by states: (1) the development and release of the Common Core State Standards; (2) the Race to the Top (RTT) State Grant competition and RTT Assessment Grants competition; and (3) the ESEA flexibility package provided by the Department of Education (ED) to states with approved applications. As of June 2014, 43 states, the District of Columbia, 4 outlying areas, and the Department of Defense Education Activity (DoDEA) had at some point adopted the Common Core State Standards. Indiana, Oklahoma, and South Carolina recently became the first states to adopt and subsequently discontinue use of the Common Core State Standards.”