What event inspired the Jewish journalist Theodor Herzl to organize the political Zionist movement?

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The Dreyfus Affair, which involved a French-Jewish officer falsely accused of spying, highlighted the anti-Semitic attitudes prevalent in Europe and convinced Herzl that the only solution for Jews was the establishment of a Jewish state. He organized the first Zionist Congress in 1897, which aimed to promote Jewish immigration to Palestine and the establishment of a Jewish state.

What Event Inspired the Jewish Journalist Theodor Herzl to Organize