Nearly 100 years ago, President Woodrow Wilson created the National Park Service, the agency that currently maintains 84 million acres of American land in 397 national parks—from the nation’s tallest mountains to our most wild forests. Since Wilson’s era, the U.S. park system has grown substantially. In 1920, one million people visited the parks each year. Now, more than 280 million visitors utilize our parks annually. That’s nearly 90 percent of Americans. But the preservation of these wild spaces is not a given.