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WASHINGTON — The Trump administration on Friday finalized its plan to loosen Obama-era protections on the habitat of the sage grouse, an imperiled ground-nesting bird that roams across 10 oil-rich Western states.

The plan, which would strip away protections for the bird on nearly nine million acres of land in the West — making it easier for oil and gas companies to drill on that land — was first detailed in a draft proposal published in December.

The sage grouse plan is the latest step in a series of moves by the Trump administration to promote oil and gas drilling on public land, in support of what President Trump has called a policy of American “energy dominance.” The architect of the plan, David Bernhardt, is a former oil lobbyist who now serves as acting head of the Interior Department.

Mr. Trump has nominated Mr. Bernhardt to formally assume the position of interior secretary.

“The plans adopted today show that listening to and working with our neighbors at the state and local levels of government is the key to long-term conservation and to ensuring the viability of local communities across the West,” Mr. Bernhardt said in a statement on Friday.