Capitol attack reflects US extremist evolution over decades

The takeover in 2016 by right-wing extremists of a federal bird sanctuary in Oregon. A standoff in 1992 between white separatists and federal agents in Ruby Ridge, Idaho. The 1995 bombing of a federal building in Oklahoma City that killed 168 people.

Right-wing extremism has previously played out for the most part in isolated pockets of America and in its smaller cities. The deadly assault by rioters on the U.S. Capitol, in contrast, targeted the very heart of government.

And...