A decade after the passage of the Affordable Care Act, about one out of every five Texans under age 65 still do not have health insurance. Georgia, Oklahoma and Florida are close behind. The contrast with Hawaii, Minnesota, Michigan, and New Hampshire is stark – only about one in 20 of their residents lacked insurance in 2018, the most recent year of available data, according to the Kaiser Family Foundation’s annual roundup of insurance coverage in the 50 states. Despite this glaring disparity, the share of Americans lacking coverage has dropped dramatically across the board, including in Texas. Texas’ uninsured rate fell from 26 percent in 2010 to 18 percent in 2018. This translates to 2.3 million more people wit…