On March 1, 1872 President Ulysses S. Grant signed into existence the world's first national park, Yellowstone National Park. The 2.2 million acres of wilderness is the only complete mid-latitude ecosystem left on the planet.
1872年3月1日,美国总统尤利西斯·S·格兰特签署了设立世界首个国家公园——黄石国家公园的法案。这片220万英亩的荒野是地球上仅存的完整中纬度生态系统。