There is robust evidence that children lost ground academically as a consequence of the pandemic, but less research into how the effects varied by school district and household demographics. Using test data from 2.1 million students across the US, this column finds that remote instruction was a primary driver of widening achievement gaps by race and poverty. The authors argue that low-income districts that taught remotely in 2020-21 will need to spend nearly all of their federal aid on academic recovery to help students recover from pandemic-related achievement losses.