quality:correction, linguistic:paraphrasing
Between the two World Wars

After the immense loss of nearly ten million men to trench warfare, a sweeping change of attitude toward militarism crashed over Europe, particularly in nations such as Great Britain, where many questioned its involvement in the war. After World War I's official end in 1918, peace movements across the continent and the United States renewed, gradually gaining popularity among young Europeans who grew up in the shadow of Europe's trauma over the Great War. Organizations formed in this period included the War Resisters' International, the Women's International League for Peace and Freedom, the No More War Movement, the Service Civil International and the Peace Pledge Union (PPU). The League of Nations also convened several disarmament conferences in the interbellum period such as the Geneva Conference, though the support that pacifist policy and idealism received varied across European nations. These organizations and movements attracted tens of thousands of Europeans, spanning most professions including "scientists, artists, musicians, politicians, clerks, students, activists and thinkers."