Answer:
Charlemagne was crowned Roman Empire
Reform the stock market--the stock market was a major cause to the Great Depression and FDR felt it needed to be watched.
The securities act and exchange commission became the watchdog for the stock market. It made sure the companies were reporting accurate information and people were not buying stocks on margin (on credit). This regulation was meant to prevent a crash of the stock like 1929.
The temple of Artemis is the most brilliant of the wonders that Antipater has seen. This is the main idea because the passage talks about all the amazing stuff the main character has seen, but the temple is more beautiful than all those things.