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This is in pre-1900 because I think the PoD would probably have to be 19th or 18th century, even if the full evolution of the situation in the title does not play out until the 20th century.

In OTL the 13 Colonies rebelled from the UK 1776-1783. One-hundred thirty-four years later, US troops came to Europe and fought alongside UK troops. They did it again 25 years after that, and then the US and UK joined in the NATO alliance in 1949.

It was a "special relationship".

Your challenge is to have a Spanish, Portuguese, Dutch or French colony in the New World win independence from the "mother country" but then by some point in the 20th century become a fighting ally with the mother country in Europe, Africa or Asia.
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