Despite Republican efforts to undermine the Affordable Care Act, insurance premiums will go up only slightly in most states where carriers have submitted proposed prices for next year. And insurance carriers are entering markets rather than fleeing them. The improvements stem from less political uncertainty over health policy, steeper than necessary increases this year, better understanding of the markets, improvements in care and a host of actions taken by individual states.Average proposed premiums for all levels of plans in California, Colorado, Delaware, Florida, Indiana, Nevada, Ohio and Pennsylvania will increase less than 9 percent in 2019, according to the Kaiser Family Foundation.By contrast, this year’s mid-priced plans increased an average of 37 percent nationally compared to 2017.In some states, 2019 premiums are projected to decrease.