Pepe LePew,
The State of Alaska assumed the Child Protection Services for Alaska Natives because Alaska was put under PL280, with five other states. Tribes had no say in the matter.

What PL280 is : "Public Law 280 is a federal statute enacted by Congress in 1953. It enabled states to assume criminal, as well as civil, jurisdiction in matters involving Indians as litigants on reservation land. Previous to the enactment of Public Law 280, these matters were dealt with in either tribal and/or federal court."

States : "Enumerated in Public Law 280 were six states which were obligated to assume jurisdiction from the outset of the law: Alaska, California, Minnesota, Nebraska, Oregon, and Wisconsin. States that have assumed at least some jurisdiction since the enactment of Public Law 280 include: Nevada, South Dakota, Washington, Florida, Idaho, Montana, North Dakota, Arizona, Iowa, and Utah." (Note: Metlakatla in Alaska retained rights)

*States can opt out of PL280.
*ICWA 1978 All states