•Why it earns a slot
As the oldest written national constitution still in active use, this 1787 document created the specific institutional architecture of separated powers, checks and balances, and federal supremacy that has governed the United States for more than two centuries and influenced constitutions worldwide.
Drafted in 1787 and signed by delegates from twelve states, the Constitution establishes the framework of the federal government through seven articles covering the legislature, executive, judiciary, interstate relations, amendment procedures, federal supremacy, and ratification. It opens with a Preamble declaring that the people themselves ordain the document to form a more perfect union, establish justice, and secure liberty. This text presents the original unamended Constitution and does not include the Bill of Rights or later amendments.
This distillation is written from the freely available original, which is always the better read when you have the time: gutenberg.org.