A long but interesting read. I do not consider this article the gospel truth. No one has a monopoly on the truth. However, it does contribute to the understanding of reality. Americans score poorly in math partly due to the method of instruction. However, this article does not address work ethic of students or other issues that can and do contribute to poor math performance in the US.
Enjoy!
http://mobile.nytimes.com/2014/07/27/magazine/why-do-americans-stink-at-math.html?_r=0&referrer=