The ‘Special Relationship’ Between the U.S. and U.K. Is Unlike Any Other Alliance. Here’s How It Got That Way

Though U.S. President Donald Trump's visit to the U.K. this week has sparked protests, with hundreds of thousands planning to demonstrate in London on Friday, the relationship between those nations and their leaders is typically a close and friendly one. In fact, it's so friendly — and, experts say, so unusual in its specifics — that it has its own name: the "special relationship."

But why do we call it that? Why not just call it an alliance?

The phrase can be traced back to Mar.