Since the last bit of my proposed TL contained a typo error, here is the corrected version:
What about a more successful Seven Years War for the UK? Which would mean that Britain also gains Cuba? Then once the American Revolution starts, the British introduce a Quebec Act (which also is expanded to Cuba in this case) which is a extension of the Irish Penal Laws in practice.
This means that the French and Spanish Speaking Catholics formally join the ARW and means that the Founding Fathers would consist of English, French and Spanish Speakers, Protestants and Catholics and White and Mixed-Race. As well as the likelihood of the Iroquois siding with the Patriots (because the British are even more likely to face defeat than in OTL and if they do there is no safe haven for them escape to). The United States also has Nova Scotia, Jamaica, The Cayman Islands and The Bahamas from the start as well.
When the Napoleonic Wars happen, the British need wood for their navy and the Americans need to gain the Louisiana Territory off the French. Eventually they come to "devils agreement" for the British to back the Americans in a war against the Spanish and French to gain Louisiana Territory and the French (who also hold the Dutch Caribbean Colonies) and Spanish Caribbean Colonies (and French/Dutch Guinea).
Due to the fact both nations are busy fighting in Europe, they lose this battle, which also helps the British as every army sent across the Atlantic is one less to deal with in Europe. Britain also sells Ruperts Land/Oregon Territory/NWT to the United States.
To compensate the loss of BNA, the British have a more successful invasion of RDP (Now Argentina and other nearby states) and gain that and Chile as a new colony called "British South America", when you add that to the turmoil caused by Napoleons invasion of Spain in South America and the example of their fellow Spanish Speaking Catholics in Cuba (in comparison to how Madrid rules over them), the Viceroys of Spanish South America are in revolt.
America is not best pleased with the Britain's antics in RDP, thus they introduce a ITTL Monroe Doctrine and get involved in the South American Wars of independence, which were successful in New Granada and New Spain. Peru was a mixed bag, Lower Peru was freed from Spanish rule but Upper Peru fell to the British.
New Spain, New Granada and Lower Peru become the independent republics of Mexico, Gran Columbia and Peru respectably and thanks to their shared experience in the war, build close ties with the United States, which leads to Protectorate Status for all 3 (which all eventually become States of the US)
The question of slavery leads the slaver regions to break off and form the CSA, because of the numerical disadvantages they have over the remaining USA they soon faced defeat. Britain and France however had concerns about the rise of the United States, so to put down a potential rival they end up backing the CSA, this in turn encourages Russia to make the most of that potential chance to take Constantinople.
Thus there is a world war and eventually the Americans defeat the Brazilians (and take the Northern Part of the country), France, Spain and Britain (who lose their Caribbean Colonies, Newfoundland, British Guinea and Upper Peru).
Eventually there is another war against Britain and Brazil later on which eventually results in the annexation of the remainder of British South America and Brazil (considering the British tried to destory the United States, the latter is not keen on them remaining in the continent), they may or may not take Australia/New Zealand as well.