The railroad companies owned – vast tracts of lands granted in return for building the railways – did not agree with Powell’s views on land conservation. They aggressively lobbied Congress to reject Powell’s policy proposals and to encourage farming instead, as they wanted to cash in on their lands. The U.S. Congress went along and developed legislation that encouraged pioneer settlement of the American West based on agricultural use of land. Politicians based their decisions on a theory of Professor Cyrus Thomas who was a protege of Horace Greeley. Thomas suggested that agricultural development of land would change climate and cause higher amounts of precipitations, claiming that ‘rain follows the plow’, a theory which has since been largely discredited.