Michigan Compiled Laws, Chapter 3. Federal and Interstate Relations § 3.907

Sec. 7. When the United States tenders to the state a relinquishment of legislative jurisdiction theretofore acquired by it over these lands, or any part thereof, described in section 1,  1 the governor may accept on behalf of the state the legislative jurisdiction so relinquished. The governor shall indicate his acceptance of relinquished legislative jurisdiction by a writing addressed to the head of the appropriate department or agency of the United States and it shall be effective when deposited in the United States mails.