President Barack Obama signed landmark legislation Wednesday that will pay American Indians and black farmers $4.6 billion to deal with claims of government mistreatment over many decades.

Mr. Obama promised during his campaign to work toward resolving disputes over the government’s past discrimination against minorities. The measure he signed Wednesday settles a pair of long-standing class-action lawsuits. The measure also settles four long-standing disputes over Native American water rights in Arizona, New Mexico and Montana.

At a signing ceremony at the White House the president declared, “It’s finally time to make things right”.

Elouise Cobell, a member of the Blackfeet Tribe from Browning, Montana, the lead plaintiff in the Indian case, called the signing ceremony “breathtaking,” adding that she did not expect it to happen in her lifetime. Ms. Cobell filed the suit almost 15 years ago and led efforts to reach the $3.4 billion settlement a year ago and then push it through the House of Representatives and the Senate.

At least 300,000 Native Americans who say they were swindled out of royalties overseen by the Interior Department since 1887 for oil, gas, grazing and timber rights. The plaintiffs will share the settlement.

Ms. Cobell said she was driving her car in Montana when she learned the Senate had approved the measure last month. “I pulled over and I cried,” she said.

Even with Mr. Obama’s signature, the settlement still must go through a gauntlet of court hearings, a media campaign to notify beneficiaries, waiting periods for comments and appeals. The first check is not expected to reach tribal plaintiffs until August.

Even so, Ms. Cobell said the day was historic.

“This day means a lot to the elders, because it basically means they receive justice,” she said. “The money is secondary. They got justice. The United States government gave them justice.”

Democratic Sen. Blanche Lincoln used similar language to describe the black farmers case, which marks the second round of funding from a class-action lawsuit originally settled in 1999. The case, which involves allegations of widespread discrimination by local Agriculture Department offices in awarding loans and other aid, is named after Timothy Pigford, a black farmer from North Carolina who was an original plaintiff.

The new settlement, totalling nearly $1.2 billion, is intended for people who were denied payments in the earlier settlement because they missed deadlines for filing. Individual amounts depend on how many claims are successfully filed.

Some Republicans have warned that black farmers might make up stories of discrimination that are hard to prove. Republican Rep. Steve King likened the program to “modern-day reparations” for African-Americans and argued that the claims process is rife with fraud.

Agriculture Secretary Tom Vilsack and Attorney General Eric Holder said the bill includes new safeguards to prevent fraud, including an extended court approval process and government audits.

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