For your us history class, you are assigned to give a speech about how the us economy has significantly changed in the past 200 years. which us historical event would be most effective to reference in your speech? select one of the options below as your a. flooding of new orleans, louisiana, after hurricane katrina b. discovery of gold in california 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