大家一定要掌握关于SAT2美国历史的一些词汇，下面无忧小编为大家介绍以字母O开头的SAT2美国历史词汇表整理，词汇中涉及到了重要的历史事件、历史时期以及人物，非常全面，大家在复习SAT2美国历史时可以进行参考。

　　O

　　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.

　　以上就是以字母O开头的SAT2美国历史词汇表整理介绍。接下来无忧小编还会连续为大家介绍其它SAT2考试词汇，希望大家持续关注。无忧小编祝大家都能取得优异的SAT2考试成绩!