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It would be the "Constitution" that was completed in 1787, since this came after both the Declaration of Independence and the Articles of Confederation, but before the Gettysburg Address.
the Constitution
The US began with a government based on the Articles of Confederation. After it became apparent the Articles were not working, the government formed a convention to revise the Articles. However, the Articles required unanimous support to create any change, so the Founders decided to create a new document. Members of the states created a new document, the Constitution, in 1787 and then sent the document to be ratified by the states. It was ratified in 1788 and the new government began operating in March of 1789.