How many National Historic Trails are there?
In addition to the country’s national parks, the National Park Service also oversees a network of 19 fascinating National Historic Trails. Hundreds of thousands of colonists, missionaries, soldiers, traders, fur trappers, settlers, explorers, Native Americans, and even letter carriers walked, paddled, or rode across vast areas of the country via these trails — long before many colonies, territories, or states even existed.
Source: National Park Service