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Norman Rockwell could not have painted a more compelling portrait of 2016 Americana than the scene at the Slider House. The three-month-old Rock Hill restaurant is the embodiment of suburban utopia: Children romp through a fountain just off the restaurant's patio while mom and dad — decked in Tory Burch flip-flops and trendy graphic tees — recline in Adirondack chairs and sip cans of craft beer served in koozies while waiting to eat mini burgers.…