Organic act

In United States law, an organic act is an act of the United States Congress that establishes an administrative agency or local government,[1] for example, the laws that established territory of the United States and specified how are is to be governed, or established agency to manage certain federal lands.

The Northwest Territory covered more than 260,000 square miles and included all of the modern states of Ohio, Indiana, Illinois, Michigan, Wisconsin, and the northeastern part of Minnesota.

The District of Columbia Organic Act of 1801 incorporated Washington, D.C., and placed it under the exclusive control of the United States Congress.

The Organic Act for the Territory of New Mexico was part of the Compromise of 1850, passed September 9, 1850.

Primarily concerned with slavery, the act organized New Mexico as a territory, with boundaries including the areas now embraced in New Mexico, Arizona, and southern Colorado.

Northwest Territory of the United States, 1787
This 1856 map shows slave states (gray), free states (pink), U.S. territories (green), and Kansas in center (white).