What we know 90 days later is that the insurrection was the result of a large, diffuse and new kind of protest movement congealing in the United States.

The Chicago Project on Security and Threats (CPOST), working with court records, has analyzed the demographics and home county characteristics of the 377 Americans, from 250 counties in 44 states, arrested or charged in the Capitol attack.

Those involved are, by and large, older and more professional than right-wing protesters we have surveyed in the past. They typically have no ties to existing right-wing groups. But like earlier protesters, they are 95 percent White and 85 percent male, and many live near and among Biden supporters in blue and purple counties.

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