[Alkanyadela]

Point taken about Sri Lanka, but the colonial powers fought dozens of guerilla wars and won almost all of them. The US fought one in the Philippines, and won that one.

Then of course there's the Native Americans. And the Israelis do a pretty good job of whipping the Palestinians whenever they get rowdy. Israelis are safer from violence than people who live in our own capital of DC.

The colonial powers won wars against enemies that did not wear shoes, in an age where communications were limited, and the world was a lot larger, and they only "won" if you take a snap shot on a particular date in history, if you look at the map today, all the empires of the colonial powers are gone.
The Philippines are independent. As far as the native Americans go, the country has been populated with an imported population, so the native American are a small minority, that's not going to happen in Afghanistan.