Monday, North Dakota Gov. Doug Burgum signed a bill into law to protect tribal cultures by codifying the federal Indian Child Welfare Act into state law, per an announcement from his office.

The federal Indian Child Welfare Act, enacted in 1978, gives preference to Native American families in foster care and adoption proceedings of Native children.

Also known by the acronym ICWA, it was created in response to the alarming rate at which Native American and Alaska Native children were taken from their homes by public and private agencies.

Several other states — including Montana, Wyoming and Utah — have considered codifying the act this year, as the U.S. Supreme Court considers a challenge to the federal law.

A handful of white families have claimed the law is based on race and is unconstitutional under the equal protection clause. They also said it puts the interests of tribes ahead of children. Lower courts have been split on the case.

The outcome could undercut federal law. Tribes also fear more widespread impacts on the ability to govern themselves if the justices rule against them.

Supporters of the law include Native American leaders who have long championed it as a way to preserve Native families and culture. Opponents include non-Native families who have tried to adopt American Indian children in emotional legal cases.