For the next sixty years, only a few other trappers traveled through the area, and the same thing happened to them. When they reported that Colter had been right, nobody listened to their stories. Then three expeditions between 1868 and 1871 visited Yellowstone and took the news of its wonders back to the East. One year later, on March 1, 1872, the United States President Ulysses S. Grant signed a law to create the first national park in the world.