Original: During the Second Boer War (1899 - 1902), the South African Republic was annexed as the Colony of the Transvaal, which existed until 1910, when it became the Province of Transvaal in the Union of South Africa.
Simplified: During the Second Boer War (1899 â "1902), the South African Republic was annexed as the Colony of the Transvaal, which existed until 1910, when it became the Province of Transvaal in the Union of South Africa.