British rule in Burma
The term "Shan States" was first used during the British rule in Burma as a geopolitical designation for certain areas of Burma (officially, the Federated Shan States, which included the Karenni States, consisted of today's Shan State and Kayah State). In some cases, the Siamese Shan States was used to refer to Lan Na (northern Thailand) and Chinese Shan States to the Shan regions in southern Yunnan such as Xishuangbanna.