South Dakota (left) and North Dakota (right), New Cases per Day. The dark red line is the rolling average.
Source: The COVID Tracking Project, September 3, 2020.
Last week, I went on in detail about the explosion of new coronavirus cases in the host state and bordering states subsequent to the Sturgis, South Dakota Motorcycle Rally. Across the United States, 17 states had increases of at least 10% in case rates over the last two weeks, including all those surrounding and including South Dakota.
Legend: South Dakota and the surrounding states with the increase in the rates of new cases over the past two weeks. South Dakota, Iowa and North Dakota ranked first, second and third, respectively among all states in terms of the highest rates of percent increases. For highest overall rates of new cases for this past week, Iowa, South Dakota and North Dakota ranked one, two, and three, as seen in the weekly graphs presented below.
Why this particular pattern? I doubt one explanation would cover everything, but the directions leading west (Montana and Wyoming) are sparsely populated. Interstate 90 passes through Sturgis and crosses east to where it connects to Interstate 29 near the Minnesota and Iowa borders.
Red States and Blue States: A Statistical Analysis.
Weekly Case Rates
This week presented without commentary.
Iowa
South Dakota
North Dakota
Alabama
Kansas
Mississippi
Tennessee
Georgia
Arkansas
Missouri
Hawaii
Oklahoma
Nebraska
Texas
Idaho
Indiana
North Carolina
North Carolina
Illinois
South Carolina
Louisiana
Kentucky
Florida
Minnesota
California
Montana
Wisconsin
Utah
Virginia
Alaska
Rhode Island
Maryland
Ohio
Michigan
District of Columbia
Arizona
Washington
Delaware
New Mexico
Wyoming
West Virginia
Massachusetts
Oregon
Colorado
Pennsylvania
Connecticut
New Jersey
New York
Maine
New Hampshire
Vermont
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