In March of 2020, the residents of Santa Fe became aware of unexpected viral visitors. Calypsa Rioja's high school play hadn't yet been canceled. Nine-year-old Navajo Huerta Eyre could still mingle with her friends outside Santa Fe's Frida Kahlo Elementary School. Jamaican Marley Smith was still singing in clubs. Restaurants were still serving margaritas, chips, and salsa.Yet an inland tide was arriving with little more fanfare than coughs, congestion, and fatigue. Tourists from neighboring Texa...