The No Child Left Behind law was passed by Congress in 2001. That was the first year of the presidency of George W. Bush. He was president from 2001 to 2009.
In those pre-9/11 days, President Bush's major goals had more to do with domestic policy than with foreign policy. Improving education was one of his major goals for his presidency. He proposed the No Child Left Behind law within a week of becoming president. It passed Congress in June of 2001 and was signed into law by President Bush in January of 2002.
The No Child left Behind Act was first put into affect so that children with disabilities of all kinds received the same education and services as all in the school system.