by boats and planes
because they wanted too
July 1937 http://www.historylearningsite.co.uk/china_war.htm
July 7, 1937 - September 2, 1945
The Japanese invaded China on July 7 1937.
Type your answer here Hongkong,Shanghai, Nanking and Qingdao
Asia, specifically japan began a full scale invasion of china on July 7, 1937; shortly before WWII is considered to have started.
they attacked china