The Declaration of Independence is a

A Declaration of Independence or declaration of statehood is an assertion by a defined territory that it is independent and constitutes a state. Such places are usually declared from part or all of the territory of another nation or failed nation, or are breakaway territories from within the larger state.

Document sent to king George during the revolution basically saying You don't own us anymore, In a nutshell it was history's first break up text, hahahaha