In 1950, the day after the outbreak of the Korean War, she traveled to the United States together with writer and activist Nogami Yaeko and three other members of the Japan Women's Movement () in order to present US Secretary of State Dean Acheson with a request that a system be created in which Japan could remain neutral and pacifist. Hiratsuka continued to champion women's rights in the postwar era, founding the New Japan Women's Association () in 1963 together with Nogami and noted artist Iwasaki Chihiro, and continuing to write and lecture up until her death in 1971.
In 1950, on the day following the Korean War's commencement, she journeyed to the United States alongside writer and activist Nogami Yaeko and three other members of the Japan Women's Movement in order to present US Secretary of State Dean Acheson with a proposal that Japan could remain neutral and pacifist. Hiratsuka continued to advocate for women's rights post-war, establishing the New Japan Women's Association together with Nogami and noted artist Iwasaki Chihiro in 1963, and remained active as a writer and lecturer until her passing in 1971.