Indiana Social Studies 8.H.12
The Standard
Interpret how the events surrounding the Louisiana Purchase (1803) and Lewis and Clark expedition (1803-1806) allowed for America’s initial push towards westward expansion.
2026 Indiana Academic Standards: K-12 Social Studies
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students explain how buying France's claim to a large western territory gave the U.S. room to expand. They use a map to show how the Lewis and Clark expedition gathered information about routes, resources, and Native nations.
What Mastery Looks Like
- Students place the purchase before the expedition and explain what each contributed to westward expansion. They can identify Native nations along the route and explain that the land was already inhabited.
Common Misconceptions
- Students may think Lewis and Clark found empty land or that their trip caused the purchase. Some assume the purchase led to immediate U.S. settlement across the whole region.
How to Assess It
- Exit ticket: Explain one way the purchase and one way the expedition supported westward expansion. Why was the land not empty?
Lesson moves
Ways to Teach It
On a printed 1803 map, shade the purchase, trace the expedition route, and mark Mandan and Nez Perce lands.
Ask, "Did the Louisiana Purchase give the U.S. empty land?" Use a Native nations map to support answers.
Give pairs six event cards, including the 1803 sale and 1804 departure, to sort by date and explain each link.
Compare the expedition route with a modern highway map, then explain why people still travel along the Missouri River corridor.
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Describe the causes, courses, challenges, compromises, and consequences associated with westward expansion, including the concept of Manifest Destiny.
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