Write a plausible, interesting, realistic and riveting backstory for an alternate version of Code Geass where the following events happen in chronological order:


The American revolution succeeds, but the United States becomes a colonial protectorate of the Hapsburg monarchs and the Austrian Empire. As a result, many Tories and other British loyalists migrate to Canada and other parts of the British New World.


The French Revolution still happens and Napoleon still manages to consolidate his control over Europe, but is unable to invade Britain itself.


The government of the Kingdom of Prussia, along with many of its supporters, soliders and loyalists, all flee to the British colony of Jamaica, where they overthrow the colonial government and set up a government in exile. The Prussians also secure the Jamaican territories of British Honduras, the Turks and Caicos and the Cayman Islands while consolidating their control. They also free all the slaves and remove all restrictions on religious worship.


The Hapsburgs escape from Austria to their colonies of the United States and Mexico, forming the Colombian Federation as a government in exile for the Austrian Empire.


The Haitian Revolution is successful in implementing its original goal of creating a base for a successful Polish state in the Caribbean, and the Haitian Empire is born, encompassing the whole of Hispanola. Polish independence activists and their supporters flee there and start trying to create a new Poland in Haiti.


Irish resistance forces also escape to Montserrat, overthrowing the colonial government and forming the Irish Kingdom in exile.


The flight of the British monarchy to Canada occurs after the Entente loses WW1 to an alternate Central Powers consisting of the German Confederation, Greater Hungary, the Czardom of Bulgaria and the Ottoman Empire. During the Emblem of Blood and the creation of the Holy Brittanian Empire, the Windsors are overthrown by the Taragayens and the other Houses of Westeros, who have been transported to Earth by an unknown force. 

The putsch is near-bloodless, Aerys the Mad becoming Emperor Aerys I of Brittania.


In Asia, due to the Japanese government deciding to retain its claim of being the Tang dynasty in exile and Yi-Seong-gye dying before he could achieve greatness, the three kingdoms of Korea remain Japanese prefectures and so there is no need for the Meiji Restoration, leading to Japan remaining a shogunate under the Tokugawa clan. The Japanese imperial family, the House of Yamato, retain their original name of Li and still press claims to the Mandate of Heaven, but the chaos in China after the 1911 Xinhai Revolution means that no one pays attention to these claims.


China is eventually reunified under the rule of the Empire of China lead by Yuan Keding, the son of Yuan Shikai. But East Turkestan, Tibet and Inner Mongolia remain independent, but the Great Qing Empire still exists in its homeland of Manchuria.


A Second World War between Brittania, a fascist European Union and a Trotskyist Soviet Union sees the Hapsburgs and Hohezollerns returning to Austria and Prussia respectively, greeted by cheering crowds. 

The Hohenzollerns quickly unify Germany and balkanize the British Isles while the Haspburgs form the Danubian Federation.

 The Poles in Haiti and the Irish in Montserrat quickly accompany them and reclaim their home nations.