 The Sapporo Municipal Subway system was inaugurated in 1971, which made Sapporo the fourth city in Japan to have a subway system.From February 3 to 13, 1972, the 1972 Winter Olympics were held, the first Winter Olympics held in Asia.On April 1 of the same year, Sapporo was designated as one of the cities designated by government ordinance, and seven wards were established.