We place low value on science and math. Many states think school is a place to teach religion or withhold science in lieu of religious belief. In populated states such as California, Texas, and New York, a high immigrant population tends to lower scores at english speaking schools and raise the dropout rate. Teachers' unions put kids in the backseat (out here in California, the average teacher makes 59,000 a year and California still boasts some of the lowest test scores, so funding isn't an issue). It really just gets broken down into value. We value capitalism and looking out for ourselves so the school system is filled with people who look out for themselves, not the kids.
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