In the first six months of 2018, 28.5 million Americans were uninsured—20.1 million fewer than 2010, the year the Affordable Care Act was signed into law by then-President Barack Obama, according to data from the federal Centers for Disease Control and Prevention. The distribution of new coverage, however, is uneven, as shown in the data for states that expanded Medicaid coverage compared to those that did not. (Alexandre Tanzi, Bloomberg News)