An omnibus bill for statehood for North Dakota , South Dakota , Montana , and Washington titled the Enabling Act of 1889 was passed on February 22 , 1889 during the administration of Grover Cleveland , but it was left to his successor , Benjamin Harrison , to sign proclamations formally admitting North Dakota and South Dakota to the Union on November 2 , 1889 .
On November 2 , 1889 , North Dakota ( and South Dakota ) became part of the United States .