Rubuta ci gaba ga wannan sakin layi - A 1941, Amurka ta yanke wasu shawarwari don tallafawa China a yakin da take yi da Japan: An ba da kayan aikin Lend Lease bayan da Shugaba Franklin D. Roosevelt ya ba da sanarwar kare kasar Sin don zama muhimmiyar kariya ga Amurka. A lokacin bazara, yayin da Japan ta koma kudu zuwa Indochina ta Faransa, Amurka, Burtaniya da Netherlands sun kafa takunkumin man fetur a kan Japan, suna yanke kashi 90% na kayayyakinta. Dokar ta yi barazana ga ayyukan Kwantung Army, wanda ke da sojoji fiye da miliyan a kasar Sin. Japan ta mayar da martani tare da hadin gwiwar hadin gwiwa a ranar 7 ga Disamba, ta kai hari kan Pearl Harbor, Philippines, Malaya
, Singapore, Hong Kong, Guam, tsibirin Wake, da kuma Thailand.