Answer:
Compass
Explanation:
A compass is a symbol used on maps to show North, South, East and West
Separation by density is the answer
Americans were “pushed” west for many reasons. Many Americans felt like they were missing job opportunities in eastern states. Others felt that they were treated unfairly, and many believed that there wasn’t enough land to meet their needs. They were also “pulled” to the west by factors like new land, plentiful resources, and a desire for adventure.