Westward Expansion Books for 2nd and 3rd Grade - Around For the longest time my teammates and I had a hard time finding informational, Westward Expansion books in a 2nd and 3rd grade reading level. Ones that students could read independently. There are a lot of great picture books out there about pioneers and topics related to westward movement and I use those as read-alouds. Westward Expansion Unit for 2nd Grade | Lesson Planet This Westward Expansion Unit is suitable for 2nd Grade. Students examine how the events that took place during the time of the Westward Expansion affected the pioneers and Native Americans through the seven lessons of this unit. Enhancements in transportation over time are also a part of the unit.