The 1948 Government of Burma was genuinely multi-ethnic
This photograph, taken in August 1948, shows the first President of independent Burma, Sao Shwe Thaik and Army Chief General Smith Dun inspecting troops in front of the Rangoon Corporation building after the declaration of martial law. The communist ("White Flag" and "Red Flag") People's Volunteer Organization and Mujahideen insurrections were in full swing. Karen, Kachin, and Chin battalions were fighting Burmese communist and PVO militias up and down the Irrawaddy valley.
It was also a time (the only time) when the government of Burma was genuinely multi-ethnic, with a Shan president Sao Shwe Thaik, a Burman Prime Minister, U Nu, and a Karen Army Chief of Staff, the Sandhurst-educated General Smith Dun (soon be replaced by his deputy, Major-General Ne Win).