WP series: Mathematics Stagnation Nation series: for the USA (Part 4) Math Education stagnations in the USA played more roles than the Common Core math standards impacts for the stagnations on the NAEP 2015, but the math dipping (especially the grade 8) were most likely were due to the Common Core math

This paper is an extension of the previous paper by the author on the theme of the math stagnations in almost all developed (OECD) nations internationally, for all developed English -speaking and most of the Latin Ameri can countries. The author has covered this theme for the USA math stagnations in the international math assessments, national NAEP's national math growth stagnations, most of the states' math stagnations , and at least 90 -95% of the large distri cts' (or cities' ) math stagnations over the past 5 -10-15-20 years. In this paper, the author o bserve s and demon strate s the following: 1) the longer the states had stayed with the Common Core math standards, the math grade 4 average and 25 percentile had de clined more than the USA states that had never participated in the Common Core math or those that had opted out by the end of 2014 or so before the NAEP 2015 math dipping happened for both the grade 4 and 8; 2) The similar pattern was also observed for