The empire will not go peacefully like the ones in the past, it will trigger a world war, the good news is that the third world would escape much of that war, but the bad news is that they will face mass starvation as a result of it
Why? because the Empire ensured they are all net importers of food and fought tooth and nail to ensure they never reached self sufficiency or food security, they employed their entire toolbox for this, in the case of Somalia, funding terrorists who happen to squat on all our fertile lands in the south.
There is a lot of good news for the third world, but they will first have to survive waves of famine which will wipe out a considerable amount of people, its going to take time for the third world to become self sufficient in food production.
Those that survive this will be hardened people capable of taking the nation forward.