Hannah Arendt married Günther Stern in 1929, but soon began to encounter increasing antisemitism in 1930s Nazi Germany. Adolf Hitler came to power in 1933, and while researching antisemitic propaganda for the Zionist Federation of Germany in Berlin that year, Arendt was denounced and briefly imprisoned by the Gestapo. On release, she fled Germany, living in Czechoslovakia and Switzerland before settling in Paris. There she worked for Youth Aliyah, assisting young Jews to emigrate to Palestine. Divorcing Stern in 1937, she married Heinrich Blücher in 1940, but when Germany invaded France in 1940 she was detained by the French as an alien, despite having been stripped of her German citizenship in 1937. She escaped and made her way to the United States in 1941 via Portugal. She settled in New York, which remained her principal residence for the rest of her life. She became a writer and editor and worked for the Jewish Cultural Reconstruction, becoming an American citizen in 1950. With the publication of The Origins of Totalitarianism in 1951, her reputation as a thinker and writer was established and a series of seminal works followed. These included The Human Condition in 1958, and Eichmann in Jerusalem and On Revolution in 1963. She taught at many American universities, while declining tenure-track appointments. She died suddenly of a heart attack in 1975, at the age of 69, leaving her last work, The Life of the Mind, unfinished.