Study the map to help you answer the question that follows.
 You should use the RACES writing model to help organize your information.
 R- Restate
 A- Answer
 C- Cite
 E- Example
 S- Summary
 Question:
 How had the U.S. map changed from 1820 to 1854 in terms of number of additional free slave states?
 NOTE: Pink are slave states
 Green are free states
 STARTER: The U.S. map changed in terms of free states and slave states by: