Anglo-Zanzibar War
The current Sultan (the person who rules the Sultanate of Zanzibar), Sultan Hamad bin Thwaini, who was pro-British, died. While he was alive, because he was English Council approved, he and the Sultanate of Zanzibar were on good terms with England, but when he died, a new Sultan was needed. Sultan Khalid bin Barghash, his 29-year-old nephew eventually became his successor, but Khalid was no-longer approved by England, now making him and his state enemies with the English Army. England told him to come out of hiding, but the new Sultan's response was to barricade himself in his palace even more. As expected, the Sultanate of Zanzibar was absolutely destroyed by the English Army, which led to what we know today as the Anglo-Zanzibar war, the shortest recorded war in history that lasted between 38 to 45 minutes.