circa 1903: U.S. president Theodore Roosevelt (1858 - 1919) sits atop a horse, laughing, as he and some other men prepare to enter Yellowstone, Wyoming. A railroad car sits behind them. Roosevelt was a leader in conservation policy, increasing federal land reserves under the Forest Reserves Act from 40 million to 200 million acres by the end of his second term. (Photo by Hulton Archive/Getty Images)
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