The United States has never had national standards or curricula for mathematics. Instead, each state decides, for example, what version of high-school algebra should be taught and how to assess whether students have learned it. In March 2010, the National Governors Association and the Council of Chief State School Officers released Common Core State Standards (CCSS) for English language arts and mathematics (www.corestandards.org). The goal is to have all states adopt these as their standards, making more uniform the knowledge and skills expectations for students in preparation for success in college and careers.
Daro, P., McCallum, W., & Zimba, J. (2010, April 16). Common U.S. math standards. Science, 328(5976), 285. https://doi.org/10.1126/science.1190309