How Many Colors?

Last Problem:

If your mother is named Sandy, and she only has 4 daughters, what is the name of the other daughter if the other three are named Penny, Nickle and Dime?

Answer:

“your own name” – even if you are a male, this situation is about a woman with 4 daughters – meaning you would be a daughter for the purpose of the story.

Today’s Problem:

What is the fewest number of colors you can use to color a map of the U.S. without using any of the same colors on connecting states – no border lines have the same color on both sides?