Since Gallup first asked about the Affordable Care Act with this wording in 2012, public opinion has gone through three general phases.

More Americans disapproved than approved of the law from 2013 to 2016, spanning the ACA’s troubled website rollout and uncertainty about the law’s survival because of various legal challenges in federal court.

Attitudes flipped to more Americans approving than disapproving throughout 2017 as Republicans tried to repeal the law at the start of Donald Trump’s presidency. This was mainly attributable to increased support from Democrats and independents throughout the year.

A third phase has been evident since November 2018, in which Americans have been evenly divided on the law.