During the Japanese invasion of the Manchuria, President Hoover outlined the Hoover-Stimson Doctrine—a note that was supposed to be a message to Japan and China, contains the policy of non-recognition of any international territories that was gained by brutal force.
Union soldiers were fighting for the freedom of slaves and reuniting the states. Confederate soldiers fought for protecting the confederacy. Yes, it did change over the war.
It created a need for raw materials and markets
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As a result of the Boxer rebellion, came the downfall of the <span>Qing Dynasty</span>