Whose advice was theodore roosevelt taking when he set aside 100 million acres as federal forests?

The answer is: John Muir

John Muir was a naturalist and an environmental advocate mostly known for his preservation efforts of the American wilderness which influenced then-president Theodore Roosevelt to fund and set aside many acres of land for the creation of many National Parks and Forest to preserve the Wilderness in the United States.

william mckinley

ulysses s. grant

benjamin harrison

by the way what grade r u in k12?