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In page Koos de la Rey:

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In 1907 de la Rey was elected to the colonial Transvaal Parliament, and he was one of the delegates to the National Convention which led to the Union of South Africa in 1910. He became a Senator and supported Louis Botha, the first Prime Minister, in his attempts to unite Boer and British. An opposing faction led by Hertzog wished to establish republican government as soon as possible and resisted co-operation with the British.