In September 1914, when the German victory in the First World War appeared feasible, the government of Imperial Germany introduced the Septemberprogramm as an official war aim ( Kriegsziel ), which was secretly endorsed by Chancellor Theobald von Bethmann-Hollweg (1909–17), whereby, upon achieving battlefield victory, Germany would annex territories from western Poland to form the Polish Border Strip ( Polnischer Grenzstreifen , c. 30,000 km 2 ). Lebensraum would be realised by way of ethnic cleansing , the forcible removal of the native Slavic and Jewish populations, and the subsequent repopulation of the border strip with ethnic-German colonists; likewise, the colonisations of Lithuania and Ukraine; yet military over-extension lost the war for Imperial Germany, and the Septemberprogramm went unrealised. 
After the wall came down, Sauer went to work for a software company in San Diego before being recruited back to Germany. A few years later he was awarded a professorship at Berlin’s Humboldt University. Sauer continues his quantum computational research—with brief breaks to entertain international heads of states with his wife, German Chancellor Angela Merkel. Sauer’s new workspace is in a recently renovated lab on Humboldt University’s Aldershof campus, where the GDR’s Institute of Chemistry used to sit, just across from a former Stasi military barracks.