Why did hapan seize manchuria in 1931?

Japan seized Manchuria in 1931 primarily to secure resources and territory, driven by its imperial ambitions and the need for raw materials to support its growing industrial economy. The invasion was also motivated by the desire to establish a buffer zone against the Soviet Union and to expand its influence in East Asia. The pretext for the invasion was the staged Mukden Incident, which Japan used to justify its military aggression and subsequent occupation of the region.