The Cherokee Nation reached a $75 million settlement with three of the countrys largest opioid distributors on Tuesday as part of a lawsuit claiming they had fueled an epidemic on tribal lands in Oklahoma.

The deal, with the companies McKesson Corp., AmerisourceBergen Corp. and Cardinal Health, is the first of its kind with a tribal government. Tribal leaders hailed the move as a historic victory, saying the funds would be used to address the opioid epidemic and prevent addiction.

Todays settlement will make an important contribution to addressing the opioid crisis in the Cherokee Nation Reservation; a crisis that has disproportionately and negatively affected many of our citizens, the tribes principal chief, Chuck Hoskin Jr., said in a statement.

Full terms of the settlement have not been announced, but the funds will be paid out over 6 years, the Cherokee Nation said . Officials described it as the largest settlement in the history of the tribe, which has more than 390,000 citizens.