Using the model of demand and supply for U.S. dollars, what would you expect to happen to

Question:

Using the model of demand and supply for U.S. dollars, what would you expect to happen to the U.S. dollar if, in light of a worsening geopolitical situation, Americans viewed foreign bonds as more risky than before? (You should quote the as number of units of foreign currency per U.S. dollar.)

Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...