Uprising in Tunisia

Why is Tunisia uprising?

Are the uprising people of Tunisia supported by USG, as in the recent eastern Colorful Revolutions, to create a liberal democracy which will conform to the religion and profit of USG?

Or is Tunisia a remote useless province of USG, with a vassal government, which USG carelessly ignored or cannot profitably or piously maintain by public force?

Or is this unrest stoked by local or regional factions, which will shuffle the politicians or other personnel, but little affect governing policy?