My take is that "the US" as a cohesive entity with a central government did next to nothing. The US has acted as an uncoordinated collection of state and local governments, private businesses, and some other institutions such as universities for both better and worse.

For example, the graphs for COVID cases in my county reflect the county government working with no coordination at the state or federal level, the predictable effect of having a large public university in town, and private companies that are managing the production and analysis of COVID tests with no public policy guidance.