Answer:
1) The US allied with China in the war and strenuously supported the Open Door Policy by increasing embargoes on exports of key commodities to Japan. These embargoes led to heightened tensions between Japan and the US and were one of the causes of Japan bombing Pearl Harbor in 1941 and going to war with the US in WWII.
2) The Boxer Rebellion was an uprising against foreigners that occurred in China in about 1900, begun by peasants but eventually supported by the government. A Chinese secret society known as the Boxers embarked on a violent campaign to drive all foreigners from China. Several countries sent troops to halt the attacks.
3) Big stick ideology, big stick diplomacy, or big stick policy refers to President Theodore Roosevelt’s foreign policy: "speak softly and carry a big stick; you will go far." Roosevelt described his style of foreign policy as "the exercise of intelligent forethought and of decisive action sufficiently far in advance of any likely crisis." As practiced by Roosevelt, big stick diplomacy had five components. First, it was essential to possess the serious military capability that would force the adversary to pay close attention. At the time that meant a world-class navy. Roosevelt never had a large army at his disposal. The other qualities were to act justly toward other nations, never to bluff, to strike only when prepared to strike hard, and the willingness to allow the adversary to save face in defeat.
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