What is the natural resource rich area of northeastern China that japan invaded in 1931 and later became a colony to japan Plz I need this

Manchuria

Explanation:

The war in Asia before WW II began because of the ambition of Japan. Japan wanted to rise and hold power in Asia during the 1930s. The economic crises in the 1930s and the need for the natural resources for the industries began Japan to look for territorial expansion. In 1931, Japanese soldiers seized Manchuria. Manchuria situated in the area of Northeastern China was rich in natural resources what Japan needed. Japan continued to hold it as a colony of Japan for the next several years.  

the crusaders are identified in the painting;

c. by the red crosses on their backs

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