Answer:
The reason why we need a system of currency exchange in order to conduct international trade is because different countries use different types of currency. They do so because national sovereignty allows each nation to establish its own currency. However, we need a system to pay for goods that are purchased from other countries. This is why the currency exchange system allows us to conduct international trade
Explanation:
B sure of of it treaty of Versailles
Signed after ww1
The last two seem right to me
