ChronoFive
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Setting the scene
The Affordable Care Act was signed March 23, 2010, by President Obama, the largest expansion of health coverage since Medicare in 1965. The ACA required insurance companies to cover pre-existing conditions, allowed young adults to stay on parents' plans until 26, expanded Medicaid, and created health insurance marketplaces.
What happened
The law passed without Republican votes after a year-long battle. It covered 20 million previously uninsured Americans and reduced the uninsured rate from 16% to 9%. The Supreme Court upheld it in 2012 and 2015.
Why it still matters
The ACA transformed American healthcare but remained politically divisive, contributing to polarization. March 23, 2010, marked a major step toward universal coverage in the U.S.
Background
Medicaid expansion split along party lines.