Looking at the PISA 2022 results (2022 is the most recent report, PISA is the Programme for International Student Assessment), this is clearly a way bigger problem than just the US. Many Western countries have a downward trend in maths, reading, and science scores, including Canada, France, the Netherlands, Belgium, Germany, ...

Scores for reading & science had actually been trending upwards in the US, while maths has been trending downwards for some 20 years.

Report: https://www.oecd.org/content/dam/oecd/en/publications/report...