From ABC News:

“It took three years to do it, but finally today President Obama announced that the United States will support the United Nations Declaration on the Rights of Indigenous Peoples, a document instituted in 2007 and signed by 143 nations but not the US. …”

From the “Remarks by the President at the White House Tribal Nations Conference”:

“… And as you know, in April, we announced that we were reviewing our position on the U.N. Declaration on the Rights of Indigenous Peoples.  And today I can announce that the United States is lending its support to this declaration. …”