This video shows the history of positive test results in each state. Each state’s point on the graph represents the number of positive tests per 1000 residents for the 7 day period indicated at the top. The solid bar represents where the state was 7 days prior to that. The hollow bar represents where the state was 14 days prior.
This animation shows how the virus started in WA and MI, then quickly spread to NY, where it really took off in the northeastern states.