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In page Roger Casement:

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Casement worked in the Congo for Henry Morton Stanley and the African International Association from 1884; this association became known as a front for King Leopold II of Belgium in his takeover of what became the so-called Congo Free State.[1] Casement worked on a survey to improve communication and recruited and supervised workmen in building a railroad to bypass the lower 220 miles (350 km) of the Congo River, which is made unnavigable by cataracts, in order to improve transportation and trade to the Upper Congo. During his commercial work, he learned African languages.[citation needed]