When we look at individual states, we see that New York has the best improvement of its rate, extending the doubling day from 1.8 to 4.3 days. On the other hand, the situation in Massachusetts looks a bit worrisome by comparison, with the doubling day shortened from 3.6 to 2.6. Admittedly, this result could also be caused by many reasons including travelers from epicenters such as New York City and an increased capability of testing.
Statistical evidence social distancing is working: Look at the effect on new coronavirus cases over time

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