What was a significant health care reform enacted during the Obama administration?

The Affordable Care Act, popularly known as Obamacare, was a significant health care reform enacted during the Obama administration in 2010. This legislation aimed to expand access to health insurance, reduce health care costs, and improve health care quality. It included provisions such as the establishment of health insurance exchanges, the expansion of Medicaid eligibility, and the implementation of regulations to prevent denial of coverage due to pre-existing conditions. Furthermore, the Affordable Care Act also allowed young adults to stay on their parents' insurance plans until the age of 26, which contributed to a notable decrease in the uninsured rate in the United States. Overall, this law represented a major shift in the American health care system, emphasizing both preventive care and the responsibility of individuals to obtain health insurance.