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The first document which formally looks like what is now thought of as a "constitution" is the original United States Constitution. This is the first real document which explicitly (and in great detail) lays out how a country's government is to actual work. In terms of a more basic declaration of the purpose and function of government, the Magna Carta is generally considered to be the first such document.
Sam Houston was the first president of Texas.
The MayFlower Compact was the first governed document.
The first written document that provided self government for the pilgrims was The Mayflower Compact.
the Articles of Confederation
It was not the first document written in America. The US did not come into being until the document was signed and ratified so in this sense it became the first document in the USA
That document was called the Articles of Confederation.
The Republic of Texas.
Mayflower Compact
Constitution
Texas
Articles of Confederation