With a POD any time you choose, have it so that, in 2019, the Anglosphere is all united under one government, and so is the Francosphere.
Bonus points if you can get a united Hispanosphere and Lusosphere as well.
Anglosphere : King George III's plan to visit America being unimpeded by his sickness. He end up talking to the important Colonial Aristocracy there, and having firsthand knowledge of what happened there. When British Parliement trying to push more taxations, King George end up siding with the colonists and tried to give them proper representation.
The Parliement rebelled against their King, cause the British Revolution and declaring Republic, killing most of the royal family, save one Prince who escape to America with some loyalist forces, forming Kingdom of Brittania-in-Exile there. (too much Code Geass)
British Republic end up fallen into Chaos for years, so much that the Brittania-in-America managed to invade them and restoring the Monarchy. But while the Crown is restored, subsequent Kings end up choosing to rule more and more from New England instead of directly present at London, and soon the Imperial Parliement being moved there too.
British Empire with American resources and manpower managed to keep Australia and New Zealand, while holding British Isles rather well. The Empire soon took over the South African colony and making overtures to several others.
Sure, India end up still being independent later, but most colonies with White majority end up being more or less under British-American control.