N.D. Cent. Code § 54-01-15

The United States may, with the specific consent of the legislative assembly as to each tract acquired, acquire, by purchase, gift, or condemnation with adequate compensation, such lands in North Dakota as in the opinion of the federal government may be needed for the establishment of national forests. The state shall retain a concurrent jurisdiction with the United States in and over lands so acquired to the extent that civil process in all cases, and such criminal process as may issue under the authority of the state against any person charged with the commission of any crime without or within said jurisdiction, may be executed thereon in like manner as if this section had not been enacted. The legislative consent required by this section must be in the form of a duly enacted bill.