World War One recruitment posters.

A wave of patriotism and anti-German hysteria sweeps the country as America enters the war in Europe. Members of the Home Guard, formed to replace Minnesota National Guardsmen who had been called into service, search the city for “slackers” who don’t have draft registration cards — with particular focus on saloons, pool halls, rooming houses and cheap hotels.

Photos courtesy of the Library of Congress, the East Polk Heritage Center and the Minnesota Historical Society.