This link is great to build background information and and gain insight into the topic. Students also recall any prior knowledge they may have on the topic, as some words or events may be familiar. It gives students the opportunity become more familiar with the reason why Americans chose to expand westward. The information doesn’t go into too much detail, so students can get a feel for how big the topic really is, without getting overwhelmed. It introduces events and vocabulary which students can look more deeply into should they want to. Also, there is an activity that requires students to pay attention to what they’re reading.