“ When the country reached the million-case mark in late April, the virus was more concentrated geographically — the New York area and the West Coast were the main hot spots — but outbreaks were surfacing elsewhere in vulnerable settings like nursing homes, prisons and meat packing plants…
Six weeks after reaching a million cases, the nation passed the two million case mark. It took four weeks to add the third million, and less than three weeks each to add the fourth and fifth, as states in the Sunbelt struggled following early reopenings. By the end of August, the pace had slowed slightly, and the nation was taking three weeks or more to pass each million-case milestone.
That changed in mid-October, when the virus began surging again across much of the country. The ninth million followed the eighth by just over two weeks, and now the 10th has taken just 10 days.” (A)
(A)Covid-19 Live Updates: U.S. Surpasses 10 Million Cases as Biden Assembles Task Force, https://www.nytimes.com/live/2020/11/08/world/covid19-coronavirus-live-updates?referringSource=articleShare