Yup, there's just a single national flag on earth without any of these common colors. Can you guess what it is?

For example, the Netherlands’ red, white and blue flag from the 1500s set a precedent. “Peter the Great of Russia went to the Netherlands in the late 1600s to learn about shipbuilding and ...

The U.S., France, Chile and more all have this commonality: red, white and blue flags. Here's why, as explained by Ted Kaye of the North American Vexillological Association.