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He also wrote the conservative-tinted history work "Norges politiske historie", released in three volumes between 1934 and 1936. The purpose of the work was to discredit the "Liberal Party version" of the political history, represented by Ernst Sars' works. Specifically, Gjerløw wanted to show that the Conservative Party did not lack nationalist goals. The accusations of lacking such goals stemmed from the party's attitudes to the Union between Sweden and Norway. After the war Gjerløw became less of a Conservative Party supporter; he advocated broad political cooperation and was against NATO membership. He died in December 1949 in Oslo.