What major legislation was enacted in 2010 to expand healthcare coverage in the U.S.?

The major legislation enacted in 2010 that expanded healthcare coverage in the U.S. is the Affordable Care Act (ACA). This comprehensive law aimed to reduce the number of uninsured individuals by increasing access to healthcare services and implementing wide-ranging reforms in health insurance. The ACA includes provisions such as the expansion of Medicaid, the establishment of health insurance exchanges, and the introduction of subsidies to help low-income individuals afford coverage.

Moreover, it implemented essential health benefits that insurance plans are required to cover, prohibited discrimination based on pre-existing conditions, and allowed young adults to remain on their parents' insurance plans until age 26. Overall, the ACA represents a significant shift in the U.S. healthcare landscape, focusing on broadening access to care and improving the quality of services delivered.

While the other legislation mentioned has importance in the healthcare arena, they do not encompass the same scope of healthcare coverage expansion as the ACA does.