Fourth of July gatherings, graduation parties, no-mask weddings, crowded bars — there are reasons the U.S. has racked up more than 155,000 coronavirus deaths, by far the most of any country, and is fast approaching an off-the-charts 5 million confirmed infections, easily the highest in the world. Many Americans have resisted wearing masks and social distancing, calling such precautions an overreaction or an infringement on their liberty. Public health experts say the problem has been compounded by confusing and inconsistent guidance from politicians and a patchwork quilt of approaches to containing the scourge by county, state and federal governments.