There isn't a president of Great Britain, but the prime minister when Japan surrendered was Clement Attlee. Attlee succeeded Winston Churchill on July 27th 1945.
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Kingdom of Great Britain ended in 1801.
Parliament of Great Britain ended in 1801.
Canada is still around. So is great Britain.
Communist Party of Great Britain ended in 1991.
Industrial Workers of Great Britain ended in 1924.
House of Commons of Great Britain ended in 1800.
Arts Council of Great Britain ended in 1994.
World War II
Franklin Roosevelt was president when the great depression ended and the great war began.
Ww1 started in 1914 and ended in 1918. Ww2 started in 1939 and ended in 1945.
We once helped the Great Britain ward off German attacks during World War 2, and we also helped them to rebuild themselves after World War 2 ended.
The American Revolution officially ended with Great Britain recognizing the United States in the Treaty of Paris. The treaty was negotiated in 1783.