Obamacare

Pete Souza / Wikimedia

The Affordable Care Act is celebrating its 10th anniversary. The landmark legislation has had a huge impact on the way health care operates in the United States. More than 20 million people have health insurance as a result of the ACA, according to the Center on Budget and Policy Priorities. Still, since it passed in 2010, the ACA has challenges that threaten its efficacy.

Updated at 7:20 p.m. ET