The first constitutional government in Texas was established by the Constitution of 1836. This document was adopted by the delegates at the Convention of 1836, declaring Texas' independence from Mexico and outlining the framework for the new Republic of Texas. It established a presidential system of government, defined the rights of citizens, and set forth the structure of the legislative and judicial branches.
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
The Republic of Texas.
That document was called the Articles of Confederation.
Constitution
Mayflower Compact
Texas