The curriculum of the public school system in the U.S. is determined by local authorities under district or state control. Each state selects course texts and curriculum literature that reflect its learning standards. Different educational methods between states have their effects on how teaching and learning take place, resulting in inconsistencies nationwide. Thus, teachers play an important role in the overall quality of education. According to 2014 data, the number of teachers in elementary schools has been on a steady upward trajectory in the recent years, having a positive impact on the teacher pupil ratio.
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