Often there are news stories such as this, that raise questions about the global competitiveness of the US educational system when compared to other advanced industrial nations. Yet none mention the obvious demographic difference that the United States has to contend with. White students in the United States actually do quite well when compared alone against top performing countries with the luxury of greater or nearly complete homogeneity.
The United States will continue to under perform and fall in these studies in the years to come. Another strength afforded to this country thanks to diversity. While it can polish numbers, no amount of spending or education reform can hide the truths of nature.
Below are graphics taken from Pew Research I modified to include the separate racial groups.
All data on race from https://nces.ed.gov/surveys/pisa/pisa2015/index.asp