Question: japan referred to its expansionist policy during the 1930s and early 1940s as
Answer: The Greater East Asia Co-Prosperity Sphere ( Japanese : 大 東亞 共 榮 圈 , Hepburn : Dai Tōa Kyōeiken ) was an imperial concept created and promulgated for occupied Asian populations during 1930 - 45 by the Empire of Japan .