The ____________ was the first Intergovernmental Organisation that tried to maintain peace across the world.

Commonwealth
Navigation of the Rhine
United Nations
None of the above

None of the above

The correct answer is "None of the above." The first intergovernmental organization that tried to maintain peace across the world was the League of Nations. It was established in 1920 after World War I but was eventually replaced by the United Nations in 1945.

The correct answer is "None of the above."

To determine the correct answer, we need to gather information about each option and analyze their relevance to being the first Intergovernmental Organisation to maintain peace across the world.

1. Commonwealth: The Commonwealth is an intergovernmental organization of 54 member countries, primarily former territories of the British Empire. While the Commonwealth promotes cooperation, democracy, and development among its member states, it does not have the primary mandate of maintaining peace across the world. Therefore, the Commonwealth is not the correct answer.

2. Navigation of the Rhine: The Navigation of the Rhine was a diplomatic agreement signed in 1815. It aimed to regulate the use and trade along the Rhine River, which flows through several European countries. While this agreement provided a framework for cooperation and trade, it did not have a global scope or the primary objective of maintaining peace worldwide. Hence, the Navigation of the Rhine is not the correct answer.

3. United Nations: The United Nations (UN) is an intergovernmental organization founded on October 24, 1945. Its primary goals include maintaining international peace and security, promoting human rights, fostering social progress, and achieving global cooperation. With its establishment after World War II, the United Nations represents the first major international organization explicitly designed to maintain peace across the world. Therefore, the United Nations is the correct answer.

In conclusion, the first Intergovernmental Organisation that tried to maintain peace across the world is the United Nations.