The British invaded Washington D.C. in 1812 and burnt down the White House. In 1917 the U.S. entered WWI as Britain's ally. What in the world happened in those 105 years to facilitate that incredible reversal of relations?

Greetings! Whilst other contributors can definitely weigh in on the specifics of what happened between 1812-1917 that enabled such a reversal of international relations from the two nations "across the pond" so to speak, you might find this thread on the origins of the "Special Relationship" as a helpful starting point, particularly regarding the ambiguous origins of it in the 19th century.