During World War I, she published her first press reports under a pseudonym. In Paris, she came in contact with her first great loves, representatives of countries striving for independence, such as Eduard Beneš, Tomáš Masaryk and Milan Štefánik. Between 1919 and 1939, she often travelled to Czechoslovakia. In 1918, she founded the weekly newspaper, , which she published until 1934. Thomas Mann, Gustav Stresemann, Rudolf Breitscheid and Aristide Briand were among her co-authors on the paper. Louise Weiss described those who paved the way for the closening of the German-French relationship between the World Wars as "peace pilgrims", and they called their important co-worker "my good Louise". Europe dreamed of unification and in 1930, she founded the "Ecole de la Paix", a private institute for international relations. With the takeover by the National Socialists in Germany, the possibility of a unification was over.
Politician
In 1979, Louise Weiss stood as a candidate of the Gaullist Party in the first European election in 1979. On 17 July 1979 she was elected as a French Member of the European Parliament, sitting with the European People's Party. At the time of the first election, aged 86, she was the oldest member in Parliament and thus its first 'oldest member'. She remained MEP and oldest member until her death on 26 May 1983, aged 90. The main parliament building in Strasbourg bears her name.
In 1934, she founded the association, La femme nouvelle with Cécile Brunsvicg, and she strove for a stronger role of women in public life. She participated in campaigns for the right of women to vote in France, organised suffragette commands, demonstrated and had herself chained to a street light in Paris with other women. In 1935, she unsuccessfully sued against the "inability of women to vote" before the French Conseil d'État.
Louise Weiss Museum
A section of the municipal museum of Saverne is dedicated to the life and work of Louise Weiss. It displays the collection of 600 items that she bequeathed to the town in 1981 and 1983, as well as historical documents relating to her career.
Works
Political Works
La République Tchécoslovaque, 1919
Milan Stefanik, Prague 1920
Biographies
Souvenirs d'une enfance républicaine, Paris, 1937
Ce que femme veut, Paris, 1946
Mémoires d'une Européenne, Paris 1968-1976
Novels
Délivrance, Paris 1936
La Marseillaise, Vol. I and II Paris, 1945; Vol. III Paris 1947
Sabine Legrand, Paris 1951
Dernières Voluptés, Paris, 1979
Theatrical Works
Arthur ou les joies du suicide
Sigmaringen ou les potentats du néant
Le récipiendaire
La patronne
Adaptation des Dernières Voluptés
Travel Books
L'or, le camion et la croix, Paris, 1949
Le voyage enchanté, Paris, 1960
Le Cachemire, Les Albums des Guides Bleus, Paris, 1955
Each year, the Louise Weiss Foundation awards a prize to the author or the institution which has contributed the most to the advancement of the science of peace, the improvement of human relations and efforts of benefit to Europe.