Viebig was born in the German city ofTrier, the daughter of a Prussian civil servant. She was related to Hermann Göring. At the age of eight, her father was transferred, and the family moved to Düsseldorf, where Clara attended school. She frequently returned to the Moselle scenery at Trier and vicinity, and took many walks there. When her father died, she was sent to live on the estate of some relatives in Posen, where she frequented the localLuisenschule. At the age of twenty, Clara moved to Berlin with her mother. She went to Berlin to study music, but instead of doing it, found that the stimulus of the great city, in addition to the landscapes she had already seen, was beginning to steer her toward a literary career. She was married to the Jewish publisher Fritz Theodor Cohn in 1896. The following year, Clara began a successful career as a writer and her works became much admired. After her marriage, she lived most of the time in Berlin and its suburbs.
''Das Schlafende Heer''
In her novel Das Schlafende Heer, published in 1903, Viebig praised conquest of Polish territories by German settlers and warned of "dangers" posed by Polish minority in Germany, which she characterised as "disloyal" and "uncultured". Left unchecked, she warned, Poles would overwhelm Germany and thus need to be controlled, repressed and assimilated. Viebig's viewpoint was characteristic of German attitudes at the time, and her work formed part of the German Heimatkunstliterary movement during this period. This novel became a bestseller in German Empire in 1904 and 1905, and, besides Die Wacht am Rhein, was her most read novel. In Das Schlafende Heer she depicted the alleged racial division between Poles and Germans, focusing on character of Polish women, obsessing with the distinction between blonde and black, white and dark and portraying them as plotting the demise of German men, who needed to be warned in advance. The Poles were living according to Viebig in a state of "animalistic and barbaric state", from which only German "civilizing mission" could save them, the solution to this "Polish problem" was exclusive colonization, Viebig warned that "Polish degeneracy" was "contagious". Kristin Kopp from University of Missouri writes that Viebig's novel represents a "prominent example" of narrative strategy that presents Polish characters whose external "whiteness", conceals hidden "blackness", which allows them to infiltrate German culture and undermine German colonial projects.
Later career
As her fame faded, in 1933 she published Insel der Hoffnung, which condemned the Weimar Republic and praised the colonization of the border with Poland. However, in 1936 her publications became forbidden by the Third Reich because her husband was Jewish. As Viebig was related to Hermann Göring she herself was not persecuted. She moved in 1937 to Brazil for a year, but returned a year later and tried to accommodate herself in Nazi Germany. Her work continued to be published, albeit with less regularity; eventually, on her 80th birthday in 1940, she was celebrated by the press and Nazis for her work, with Das Schlafende Heer being praised by Nazi critics as the first "Volksdeutsche novel" and important document of "national fight". While her works differ from racist Blut und Boden literature and her correspondence shows a distance from Nazism, they are filled with nationalist spirit and show some similarities to volkisch thinking.