Question: what countries are part of the allied powers

title: Allies of World War II
text: In Asia , when Japan seized Manchuria in 1931 , the League of Nations condemned it for aggression against China . Japan responded by leaving the League of Nations in March 1933 . After four quiet years , the Sino - Japanese War erupted in 1937 with Japanese forces invading China . The League of Nations condemned Japan 's actions and initiated sanctions on Japan . The United States , in particular , was angered at Japan and sought to support China . Poland