Which geographic feature impeded the expansion of the Roman Empire?

Read the following excerpt from president roosevelt's july 24, 1933, fireside chat. for many years the two great barriers to a normal prosperity have been low farm prices and the creeping paralysis of unemployment. these factors have cut the purchasing power of the country in half. i promised action. congress did its part when it passed the farm and the industrial recovery acts. today we are putting these two acts to work and they will work if people understand their plain objectives. which qualities of effective leadership does roosevelt use in this excerpt? select all that apply. humility communication self-confidence goal setting