It's more complex than that, Linda.
There was a Civil war in the Philippines between the Moslem Island of Mindanao and the Christian remainder of the country since - well - forever. (Maybe 1950's?) Since long before the Americans left. And the Moslems have been terrorizing Mindanao for forever. This, unfortunately, is not new.
As for the "asked to leave" thing, the explosion of the volcano (Mt. Pinatubo) was a big catalyst.
The politicians there DID get a little greedy, (okay, a lot greedy) but there were a lot of other things going on, too.