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Second Boer War: British troops relieve Mafeking.

Boxer Rebellion: Boxers destroy three villages near Peking and kill 60 Chinese Christians.

May 18 - The United Kingdom proclaims a protectorate over Tonga.

May 23 - Sergeant William Harvey Carney becomes the first African American to be awarded the Medal of Honor.

May 24 - Second Boer War: British annex Orange Free State as Orange River Colony.

May 28 - Boxer Rebellion: Boxers attack Belgian personnel in the Fengtai railway station.

May 31 - Boxer Rebellion: Peacekeepers from various European countries arrive in China.

June 1 - Carrie Nation demolishes 25 saloons in Medicine Lodge, Kansas.

June 5 - Second Boer War: British soldiers take Pretoria.

June 14 - The Reichstag approves a second law that allows the expansion of the German navy.