From the Webpage: "Over the past 12 months, the COVID-19 [coronavirus disease 2019] pandemic has taken a long and winding road, ranging from modest upticks and downticks to huge, nationwide spikes. Virtually all parts of the U.S. have experienced COVID-19 surges at some point, especially after the massive spikes in the fall and early winter. Although new cases have fallen in the last month, per capita new case levels--nationally and for many states--are higher than they were in late summer, and the potential for further surges is real. Thus, it is important to monitor these shifts in light of what has happened in the past year, even as the distribution of effective vaccines is now in progress. The analysis below tracks how COVID-19 has spread across regions, states, and counties over the past year, with an eye toward understanding the context of the most recent outbreaks."
Brookings Institution: http://www.brookings.edu/