How did the U.S. policymakers seek to stimulate the economy and integrate the Trans-Mississippi West into the nation, and how did this affect people living there?
a) Through land grants and infrastructure development; led to increased migration and economic growth
b) Through military conquests; led to conflicts and displacement of indigenous populations
c) Through trade agreements with foreign powers; led to cultural exchange and diversity
d) Through isolationist policies; led to limited growth and development