Men tarred and feathered in Minnesota during 1918 campaign by anti-Nonpartisan Leaguers, c.1918.

National Guardsmen patrol Plymouth Avenue in North Minneapolis, July 1967.

Civilians and National Guardsmen on Plymouth Avenue in North Minneapolis, July 1967.

Boarded-up storefronts on Plymouth Avenue in North Minneapolis, July 1967. Photographed by Twiggs.

Boarded-up storefronts on Plymouth Avenue in North Minneapolis, July 1967. Photographed by Twiggs.

Aftermath of civil unrest in North Minneapolis, July 1967. Photographed by Twiggs.

Wahpeton Dakota leader Maza Mani (Walking Iron), c.1855.

Wakan Ozanzan (Medicine Bottle) at Fort Snelling, 1864.

Dakota leader Sakpedan (Little Six, “Shakopee III”) at Fort Snelling, 1864.

Fort Snelling, c.1865.