LOUISVILLE, Ky. — Congress anointed bourbon as “America’s Native Spirit” in 1964, a designation taken seriously in Louisville, where one-third of Kentucky’s bourbon is produced. The Urban Bourbon Trail (www.bourboncountry.com/urban-bourbon) lists 19 establishments where bourbon takes pride of place in the glass and sometimes on the plate. Friends and I visited four; two more and I can claim an Urban Bourbon Trailblazer T-shirt.