I will cover both the Republic of Britain and the United Kingdom in exile just for convenience.
After the humiliating defeats and the Treaty of Berlin, revolutions and rebellions broke out, with the most successful one being in Ireland, the least successful ones were the Welsh Rebellion and the Third War of Scottish Independence. David Lloyd George quickly signed the Treaty of Berlin to hurry up and put down the Rebellions and by the end of 1918, most of the independence movements were put down, however this came at a high cost: 2/3 of the British Empire were gone, the Grand Fleet was divided and partition, the United Kingdom of Great Britain and Ireland was no more, crippling war debts to the point that the English had to literally print paper money which created hyperinflation, and now more than ever people were clamoring for the end of the Monarchy. Britain was ready to explode and one action lit the spark.
In May 23, 1920 English workers began striking for better pay and for unions, they were already suffering from the inflated prices because of the reparations Britain had to pay. The conservative Prime Minister, Bonar Law, responded by cracking down hard on the strikers. This led to violence and British troops were called upon to put down the Downs Riots, the troops responded with outright mutiny and refused to shoot at the rioters. The situation was quickly getting of control and when the Royal Navy (or what was left of it) declared that the Royal Family must abdicate and they then declared the United Republic of England, Scotland, and Wales.
View attachment 472156 Prime Minister Bonar Law
King George V chosen not to abdicate and instead fight, but Prime Minister Bonar Law was kicked out and replaced by the more radical socialist Ramsey MacDonald and he gave the Royals two options: A. Abdicate and give up all your titles and go into exile in Brazil or the United States or B. Be placed under arrest and possibly be executed. It was no contest, on May 26, King George V and Queen Mary abdicated and left on the
HMS Hood. Ending the British Empire.
View attachment 472157 King George V
View attachment 472158 President Ramsey MacDonald
Immediately chaos ensued, with what was left of the British Empire including: Australia, New Zealand, The Falklands, and Canada declaring their continue support to the King and broke away from the British Republic. So in Canada, the Royals declared their new Capital in Ottawa.
View attachment 472159 Commonwealth of the United Kingdom
Afterwards, the newly proclaimed Republic of Britain, refused to pay war reparations to Germany, Mexico, and the Danubian Empire. They responded by blockading the island, bombarding ports, and the German Luftstreitkräfte bombed the outskirts of London as a warning, until finally MacDonald gave in and agreed to keep paying reparations, but the fiasco tarnished MacDonald's reputation and he resigned as President of the Republic.
He was replaced by Richard Bell, under him he made treaties with the Soviet Union and as relief the Dawes-Obregon Plan was issued in 1924, from Mexican Secretary of the Hacienda, Alvaro Obregon and US Vice-president Charles Dawes, which meant both United States and Mexico would both help Britain and France pay their reparations together. With that the British economy began to recover and rise.
View attachment 472161 President Richard Bell
View attachment 472162 Charles Dawes
This came to a absolute end when France couldn't pay the reparations which meant Britain had to carry the full weight, which it couldn't. This caused a panic with both Germany and Mexico, like vampires, began sucking every pound out of Britain, but this made the money absolutely worthless, this triggered the Mexican and American stock market to crash, triggering the Great Depression.
None were as hard hit then Britain and France, now food prices had skyrocketed, with buying a loaf of bread costing 10,000 pounds. This led to people doing humiliating things such as women prostituting themselves, children working in the mud, and in worse cases selling children to buy food. People were blaming the socialist Government and began looking for a savior. That savior came in the form of Sir Oswald Mosley and his Union of British Fascists.
View attachment 472164 President Oswald Mosley
Mosley blamed the Irish and Catholics because they "Stabbed England in the back" and he championed fascism. In 1933, he was made President of the Republic of the Britain, however the House of Commons and 10 Downing Street "mysteriously" burned down. Mosley was quick to blame the Catholics and Communists and he then passed the Enabling Acts make him the Supreme leader. He then made a alliance with Fascist France and Sardinia, then making a agreement with the Soviet Union on the reconquest of Eastern Europe. This finally came to ahead when the Soviet Union invaded the Kingdoms of Finland and Ukraine, Germany and the Danubian Empire declared war on the Soviet Union, which was followed by the newly named Union of Britain and Fascist France declaring war on both.
Meanwhile in the Dominion of Canada, King George V was declared the rightful King of Britain and the newly created Commonwealth of the Crown which revolved around Canada. The Commonwealth then made relations with The United States, Germany, Mexico, and Brazil by doing this, they hoped that if a war broke out between the Republic of Britain and any of them then they can gain support for a restoration. Throughout the rest of the Twenties everything was quite until King George V died in 1936. He was followed by his son Edward VIII and he made a vow to reclaim his rightful birthright and that chance came in the Second World War.
View attachment 472163 King Edward VIII