(CNN) -- The Navajo Nation will mark history Friday when it officially announces a $554 million settlement from the U.S. government, putting an end to years of litigation.

The landmark agreement stems from a 2006 lawsuit in which the nation says the U.S. mismanaged trust fund assets dating back to 1946.

"It's monumental. This is the largest trust responsibility award from the United States in the history of Indian country. It will never completely redress the wrongs done to prior generations, but it's going to allow some opportunities for future generations," said Dana Bobroff, deputy attorney general for the nation.

In May, an agreement was reached between members of the Navajo Nation, the U.S. Interior and Justice departments and the Bureau of Indian Affairs and will be sealed with a signing ceremony Friday at Window Rock Tribal Park in Arizona.