Answer:
Lack of natural resources.
Step-by-step explanation:
Imperialism is an effort that's initiated by a country to strengthen their condition by conquering other country through military's forces.
Due to their bad geographical location, Japan did not possess major natural resources that is considered as "hot commodity" in the global market.
This was the reason why they started their plan to colonize different regions In Asia .(such as Manchuria, Indonesia, and Korea) They wanted to obtain natural resources at a cheaper price to improve their economy.