These days, Interior spends over $200 million a year buying land. That raises the perennial question: how much is enough? The government already owns 635 million acres, almost a third of the United States. That includes 250 million acres of BLM, 193 million acres of national forests, 84 million acres of national parks, and 150 million acres of wildlife refuges. And as the maintenance backlog demonstrates, the government cannot begin to manage it all.