The national conservation committee

provided two million jobs planting trees, building dams and irrigation systems, and established soil conservation and wildlife protection programs

conducted the first scientific study of the country's water, forest, soil, and mineral resources

set aside 150 million acres of public land as national forest reserves

set federal air pollution guidelines and extended federal enforcement power

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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(d) take jobs from american workers.