The United States is a federal republic of 50 states, a federal district, five territories and several uninhabited island possessions. It occupies a combined land area of 3,119,885 square miles (8,080,470 km2) with an estimated population of over 333 million inhabitants. Sustainable Urban Mobility Planning is a municipal responsibuility and has taken place in most large cities in the USA with extensive consultation but not following any specific methodology.