It depends on how long you're willing to roll back US interventionism. If you're talking about pre-WW1, maybe. But even by the mid-late 19th century the US started sticking its nose in the Pacific (which alarmed Japan, which contributed to that countries subsequent militarism). So I'd say you'd have to go back even further.

If not the US, it would probably be Europe and/or the Soviet Union. China and the Soviet Union nearly came to blows in the 60s.

Europe decolonized largely because Hitler wrecked major continental colonial powers France and the Netherlands) and put Britain with their backs against the wall such that it had to partially abandon its empire in order to defend itself and avoid a complete disaster. So they let India go, but tried to hold on elsewhere. This worked to some extent, but not in others. What remained tried to morph into the Commonwealth, this was only partially successful.

The US assumed the crown, this time with a different model, hegemony vs. colonialism. They had a rival in the Soviet Union, which funded Communist revolutions in many parts of the developing world. With the exception of Vietnam, something the Chinese did not do. They valued North Vietnam as a buffer against Wester imposition, but were not too keen on a reunified Vietnam, indeed they invaded a few years after South Vietnam collapsed.