You are assigned to give a speech about how the US economy changed over the past 200 years.Which historical event would be most effective to reference in your speech?
A. flooding of New Orleans, Louisiana, after Hurricane Katrina
B. discovery of gold in Cali and the arrival of prospectors
C. development of urban sprawl around major metropolitan areas
D. transformation of Midwest industrial towns into the Rust Belt
E. overthrow of the Hawaiian monarchy and the US annex of Hawaii