Can I ask a favor re political messages?

[sundial]

I do have a few questions about the US.

What's the name of the rock structure with the four presidents on it?

Why is one state called New Mexico? I guess I could locate the state info site

Why haven't they changed the colour of your money?

I'll leave you kids & venture off to bed.

1. Mount Rushmore
2. Because it's the UFO capitol.
3. Because the color green is so soothing and because the US isn't as sophisticated in the fine arts, unlike our Euro neighbors.
4. Have a good night!