It's cherry blossom time in Washington. Since lots of kids are on spring break, it's a great time to get out and see some of the beautiful trees. This week is predicted to have the best of the blooms.

That’s right: Washington, D.C., is not a state but a district. That’s where the “D.C.” bit comes in—it stands for “District of Columbia.” Although it operates as a state for all practical purposes and ...