Nonsense on stilts.
Boer War. Filipino Rebellion. Moro War. Every single American Indian War. Almost every colonial war down thru history. The Malayan Emergency. The Mau-Mau. The entire history (till 1919) of the British in Ireland. The Mongols throughout eastern Europe and most of Asia. The Romans throughout western Europe, north Africa and the Middle East. Tibet. The Russians in the Caucasus, Ukraine and Central Asia. The Incas and Aztecs. The Ottomans for several centuries.
To name just a few.
Yeah, but besides those... < /lieberal newspeak mode >
While it is true that the British and Kenyan militaries combined to defeat the Mau Mau during the Emergency of 1953-1957, within a few short years the insurgency started up again - and the Brits bailed out. Mau Mau icon Jomo Kenyatta became the first president of independent Kenya in 1963.
But otherwise, you make good points!