SAT2考试是本科生美国留学要参加的一项考试(不是必须)。下面为大家整理的是以字母O开头的SAT2历史考试中核心词汇。掌握一定的历史词汇是备考SAT2历史考试的首要前提。所以，各位考生一定要多加重视词汇的积累，预祝各位考生考试成功。

Oil embargo

In 1973, OPEC (the Organization of Petroleum Exporting Countries) nations refused to export oil to Western nations. The embargo, in effect until 1974, sparked rapid inflation in the West and had a crippling effect on the U.S. economy. The ensuing economic crisis plagued Gerald Ford’s tenure as president.

Office of Censorship

Created in December 1941. The Office of Censorship examined all letters sent overseas and worked with media firms to control information broadcast to the people in an attempt to limit information leaks during World War II.

Office of Strategic Services (OSS)

Established by the Joint Chiefs of Staff in 1942 to conduct espionage, collect information crucial to strategic planning, and assess the strengths and weaknesses of the enemy.

Office of War Information

Employed artists, writers, and advertisers to shape public opinion concerning World War II. The office publicized reasons for U.S. entry into the war, often portraying the enemy Axis powers as barbaric and cruel.

Open Door policy

Developed by Secretary of State John Hay in 1899. The Open Door policy aimed to combat the European spheres of influence that threatened to squeeze American business interests out of Chinese markets. It pressured European powers to open key ports within their spheres of influence to U.S. businessmen.

Operation Overlord

The Allied air, land, and sea assault on occupied France. The operation centered on the “D-Day” invasion on June 6, 1944 in which American, British, and Canadian troops stormed the beaches at Normandy. These Allied forces sustained heavy casualties but eventually took the beach and moved gradually inland.

J. Robert Oppenheimer

Head of the Manhattan Project, the secret American operation to develop the atomic bomb.

以上就是关于SAT2历史考试核心词汇的全面内容，是以O开头的。各位考生可以作为备考时的参考资料，希望对各位考生的SAT2考试有所帮助。

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