The Williams Constitution
10/1/2008: “An act to provide for the division of Dakota into two States and to enable the people of North Dakota, South Dakota, Montana, and Washington to form constitutions and State governments and to be admitted into the Union on an equal footing with the original States.” Thus read the Enabling Act of 1889, approved by the Fiftieth Congress on February 22, of that year. It set into motion the final division of Dakota Territory into two separate states as well as the creation of Montana and Washington.
Source: prairiepublic.org