In 1940, when Adolf Hitler's armies seemed certain to sweep across the English channel to invade the United Kingdom, Winston Churchill made a speech. He described Britain's links with the United States as a "special relationship", tying in his country's fate with that of the US, hoping his powerful words and strong rhetoric would move those who opposed American involvement in what they saw as a European war.
Seventy years later, the phrase still frames US-UK relations. It's trotted out every time the leaders of the two countries meet, and again it's been used extensively this week. Yet the Americans have never regarded it as that special.
Famously, Margaret Thatcher and Ronald Reagan enjoyed a close relationship, shared by a common ideology, a common drive towards free markets and minimal state intervention.