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What do you call the 250th anniversary of the United States?

The word semiquincentennial appears in white text on a blue background.
What do you call the 250th anniversary of the United States?
Try saying this term five times fast.
Encyclopædia Britannica, Inc.
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Transcript

Imagine this: It’s 1976. Bell-bottoms are in, disco is thriving, and America is throwing itself the biggest birthday party ever—200 years old!

That’s right, the bicentennial. Everyone knew what to call it. It was on T-shirts, coins, even lunchboxes.

Now, fast forward fifty years. Another big milestone is coming up. But this time… we have a problem. No one knows how to pronounce it.

What do we call the 250th anniversary of the Declaration of Independence? Semiquincentennial. Semi...quin...centennial. Semiquincentennial. Try saying that five times fast. Or even once.