For four years now, the consumer data science firm Dunnhumby has ranked America's top grocers.And in general, the results have felt somewhat predictable.In 2018 and 2019, the perennially-beloved chain Trader Joe's took the top spot.Last year, Joe was finally unseated by another cult-favorite, Texas-based H-E-B.But in this year's index, a new name has taken over the grocery scene. America's favorite grocer is Amazon.A massive pandemic bump was enough to propel Amazon to the top spot from third on 2020's list.Amazon accelerated past every other retailer...due to its speed to shop and virtual store format, Grant Steadman, Dunnhumby's.