Final answer:
The last event in the creation of a new U.S. Constitution was its ratification by Congress after enough states had approved it, facilitated by advocacy such as The Federalist Papers.
Step-by-step explanation:
The event related to the writing of the new U.S. Constitution that occurred in the last year is C. The new U.S. Constitution was ratified by Congress. After profound discussions on governance and various shortcomings of the Articles of Confederation, the Constitutional Convention took place in 1787. The efforts led by Federalists were pivotal to the creation of a new Constitution, strengthening the central government. The Articles of Confederation were found inadequate, leading to the drafting of a more robust document. Once enough states ratified the document, subsequent to persuasive efforts including the writing of The Federalist Papers, the Continental Congress, still technically the government, passed a resolution to put the new Constitution into operation with the requirement of eleven state ratifications meeting this condition by September 13, 1788.
The Federalist Papers played a crucial role as they advocated for a strong federal government during the time of ratification. However, it was not until the Constitution had been ratified by enough states, and the Continental Congress passed the necessary resolution, that the new system of government could truly take effect, establishing the new United States Constitution in 1789, which effectively replaced the Articles of Confederation.