Final answer:
The three principal organizations designed to facilitate international trade are the IMF, the World Bank, and the WTO. These institutions were established post-World War II to manage international financial transactions, assist poor nations, and regulate international trade.
Step-by-step explanation:
The three principal organizations designed to facilitate international trade are The International Monetary Fund (IMF), The World Bank, and The World Trade Organization (WTO). The IMF and The World Bank were established in 1946 to address issues raised by international financial transactions and to assist poorer nations respectively. The WTO, officially established in 1995, evolved from the General Agreement on Tariffs and Trade (GATT) as an institution to manage international trade and provide a forum for reducing tariffs and other barriers to trade.