Common Core, introduced in 2009 to enhance US education, faced criticism for its confusing math standards and lack of significant impact on student performance. Despite initial support, over 20 states have either revised or withdrawn from Common Core, signaling its decline in favor.

The Common Core initiative aimed to elevate educational standards in the US by implementing a uniform curriculum across 41 states and territories, supported by national leaders like Bill Gates and President Obama. Despite early enthusiasm, the initiative faced criticism and confusion, particularly in math education.

Nonprofit groups like The Council of Chief State School Officers and the National Governors Association, along with Achieve and teachers unions, collaborated to develop Common Core standards. The federal government, led by the Obama administration, promoted the standards through initiatives like Race to the Top fund.

Federally funded research conducted a decade later revealed that Common Core had minimal impact on student achievement in the United States, with studies showing mixed effects. The failure to improve student performance is attributed to the standards limiting teacher control and not considering the financial challenges faced by many students.

The Common Core standards have faced significant backlash with over 20 states repealing, revising, or withdrawing from the initiative. Despite criticisms, some states have developed new standards as replacements, indicating a shift away from the original Common Core framework.