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Assuming for a moment Sealion would have worked:
Great Britian is under German occupation for a few years.
WII goes on with as little butterflies as possible
USSR and USA still beat the Nazis but the war extends into late 1946
US invades France from the South, with a secondary landing to free England
Soviets are also slower/weaker due to less American supplies
Minor changes in the partition of Europe are not of our concern
I have read lately about the end of the Spanish empire and how the Napoleonic wars caused its final downfall, the Portugese dynasty going to Brazil ...
Similary WII caused the end of the Dutch and speeded up the end of the French Empire.
What consequences would an temporary fall of England have:
Successful Indian and Arab revolutions?
An sense of gratitude toward the colonial people leading to earlier self-goverment and more aid?
Dominions becoming independent under a cadet branch of the Windsors?