Decade ("60s" or "sixties"), although this may leave it uncertain which century is meant. These references are frequently used to encapsulate popular culture or other widespread phenomena that dominated such a decade, as in "The Great Depression of the 1930s" or "The Roaring Twenties". However, the Gregorian calendar begins with the year 1. (There is no year "zero", and the year before AD 1 is 1 BC with nothing in between.) Therefore, its "first" decade is from AD 1 to AD 10, the "second" decade from AD 11 to AD 20, and so on. So, although "the 1960s" comprises the years
Greater East Asia Co-Prosperity Sphere Great East Asia, comprising Japan, Manchukuo, China, and parts of Southeast Asia, that would, according to imperial propaganda, establish a new international order seeking "co-prosperity" for Asian countries which would share prosperity and peace, free from Western colonialism and domination. Military goals of this expansion included naval operations in the Indian Ocean and the isolation of Australia. This would enable the principle of hakkō ichiu. This was one of a number of slogans and concepts used in the justification of Japanese aggression in East Asia in the 1930s through the end of World War II. The term "Greater East Asia