1918 - On the 25th of December, he founded the Stahlhelm, Bund der Frontsoldaten and became its leader. However, he had a number of arguments with its acting leader Theodor Duesterberg.
1931 - He together with Alfred Hugenberg and Adolf Hitler, helped create the Harzburg Front, an alliance against the Heinrich Brüning government.
1933 - In April, he joined the National Socialist German Workers Party and integrated the Stahlhelm into the Sturmabteilung.
- In August, he became an SA-Obergruppenführer and later was a Reichskommissar for the Freiwilligen Arbeitsdienst.
1934 - In March, he was made leader of the German League of Front Fighters, an organization, however, that was soon disbanded.
1935 - He requested to be released from official responsibilities, but Hitler refused.
1945 - Seldte remained, without substantial power, when he became a member of the government as the Prussian Arbeitsminister.
- He was arrested at the end of the war and died in a US military hospital at Fürth, before being arraigned on charges.