What change occurred after the South African War.

The British gained diamond and gold mining rights in South Africa and the Boer Republic ceased to exist as an independent republic.

Explanation:

South African War also known as the Anglo- Boer War, Boer War or Second Boer War was fought from October 11, 1899 to May 31, 1902. The war was between the Great Britain and the Boer Republic (South African Republic and Orange Free State).

The war was triggered by  the discovery of gold and diamond in the Boer States and was finally won by the Great Britain after various attempts at peace making. The Boers surrendered in 1902 and the treaty ended the existence of the Boer Republic (South African Republic and Orange Free State) as independent republic after which they were under the British Empire.

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: