National Bison Day in the United States is celebrated on the first Saturday of November every year. It is dedicated to the historical, cultural, ecological and economic contribution of the American bison to the United States. The American bison, also known as the American buffalo, is a North American species of bison. Once widely spread throughout North America, they became nearly extinct by a combination of commercial hunting and slaughter in the 19th century. Bison were never domesticated by Native Americans, but today they are viewed as both a type of cattle and wild animals in the United States, Canada and Mexico.National Bison Day was introduced in 2012. It is actively supported by Native Americans, conservationists, bison producers, educators, and other people who care about the fate of these large mammals. In 2016, the celebration of National Bison Day entered a new stage, as President Barack Obama signed the National Bison Legacy Act into law, officially making the American buffalo the national mammal of the USA. National Bison Day is marked with various events celebrating the bison. Their main goal is to emphasize the importance of the American bison as one of the symbols of the United States, as well as the contribution of the species to maintaining biodiversity and ecosystem sustainability.