PARCC
Before No Child Left Behind, The Elementary and Secondary Education Act was passed in 1965 as a part of the "War on Poverty". In hopes of diminishing the achievement gap, the Elementary and Secondary Education Act was passed to create equal opportunity and access to education through high standards and accountability. These standards and accountability techniques came in the form of standardized testing. For the first time, federal money was being sent into local schools and made the production of test-based evidence mandatory for all educators. Standards were being assessed on these state-created exams, and local schools were then accountable to perform on these exams. In 2002, Congress re-examined ESEA and reauthorized it as No Child Left Behind Act (NCLB).
Secondary education
In 1972 the school leaving was raised to 16. The Education and Skills Act 2008, when it came into force in the 2013 academic year, initially required participation in some form of education or training until the school year in which the child turned 17, followed by the age being raised to the young person's 18th birthday in 2015. This was referred to as raising the "participation age" to distinguish it from the school leaving age which remains at 16. Thus the UK is following the ISCED Level 3 (Upper) secondary education guideline.