South African shipbuilding could guard the Cape routes

South Africa sat at the junction of the Atlantic and Indian Ocean routes but maintained only a small navy. Locally built sloops could not defeat Admiral Graf Spee alone, yet they could report a raider, organise convoys, and combine with destroyers and cruisers. Convoying would also deny surface raiders and submarines the isolated merchant targets they preferred. A later counterfactual combines a C-class cruiser, four destroyers, and eight sloops: Graf Spee could defeat the components separately, but not necessarily the whole formation. Smoke, torpedoes, and even aggressive depth-charge attacks would force the raider into a damaging fleet action instead of commerce hunting. The same yards would maintain British ships and support a regional industrial base, turning a geographic chokepoint into an active defence system.