Americans hated President Hoover. They believed that he was the source of all of their misfortune. To top off their hatred, Hoover refused to get the government involved in kickstarting the economy.
C) the exchange rate
This is when you go to another country and exchange your form of currency into that countries form of currency.
an example is that if you have 1 U.S. dollar and you exchange it for Canadian currency you would recieve $1.28 because the american dollar is worth more.
The end of the Roman Empire marked the beginning of a new era called The Middle Ages.