Why did japan feel the need to expand their borders in the 1930's?

Lack of materials

Explanation: Japan needed materials which was a majaor factor in why they invaded manchuria as a means to get much needed material to help Japan industrialize as Japan is not very rich in iron ore and other materials and as ww2 dragged on Japanese iron was described as iron sand because it was low quality and full of impurirties as the only way to keep a matrial carce Japan alive was to cut back on quality

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.

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