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1963年8月28日，当马丁·路德·金在华盛顿林肯纪念堂群众大会上，演讲了题为“我有一个梦想的演说，他可能没有意识到，这个讲话可能会导致在后来的黑人对自由民主的道路上不断向前发展。（Kurlansky186）1968年，他被人用刀刺死，但他的梦想继续。 40年后，另一位黑人奥巴马登上美国大选最后就变成了一个新的美国总统，这个国家创造了历史，让“美国梦”有着更为现实的意义。
　　　August 28, 1963, when Martin Luther King in Washington Lincoln memorial mass meeting, entitled the I have a dream speech, he may not have realized that this speech has such shattered power, can lead to blacks in the later on the road towards liberal democracy forward continuously.
(Kurlansky 186)In 1968 he was stabbed to death, but his dream continued. Forty years later, another black people Barack Obama boarded the American election and finally becomes a new American President, created the history of this country, make the "American dream" has a more practical meaning.
随着时间的推移，在21世纪的好莱坞黑人演员的比例增加一天一天，赢得奥斯卡奖的黑人演员也在增加。丹泽尔·华盛顿“训练日”的美德赢得了第74届奥斯卡学院奖最佳男演员奖，哈莉·贝瑞与电影怪物的球赢得了第74届奥斯卡学院奖最佳女主角奖，摩根·弗里曼赢得了第79届奥斯卡学院奖最佳男配角薛尼鲍迪赢得了第74届奥斯卡奖的终身成就奖。此外，杰米·福克斯，福里斯特·惠特克，珍妮弗·哈德森和其他黑人演员都获得奥斯卡奖的荣誉。
　　　Films produce or create dreams, add a lot of footnotes for "American dreams", becomes the most successful kind of art to reappear the "American dream".As time goes by, the proportion of black actors in the 21st century of Hollywood is increasing day by day, and the number of black actors who won the Oscar Academy Award is increasing too. Denzel Washington by the virtue of Training Day won the 74th Oscar Academy Award for best actor, Halle Berry with film Monster’s Ball won the 74th Oscar Academy Award for best actress, Morgan Freeman with film Million DollarBaby won the 79th Oscar Academy Award for best supporting actor, Sidney Poitier won the 74th Oscar Academy Award for lifetime achievement award. In addition, Jamie Fox, Forrest Whitaker, Jennifer Hudson and other black actors all gained the honor of Oscar Academy Award.https://www.51lunwen.org/AmericaThesis/
　　　For more than a century, the image of the blacks in American movies has dramatically changed. But to a certain extant it is still thoughtless to acknowledge a equal status between the blacks and white. The proportion of main roles of blacks is far less than their counterpart. Obtaining the same status as whites in the movie still has a long way to go for the blacks. Entman, Robert, and Rojecki (1) argue that although the physical conditions for black people has been improving since 1960s, the color of skin is still the racial identity determining the social appraisal and disadvantages the blacks in social competition. It is not only the problem about films but the issue concerning racial discrimination and human rights.
　　　Films are naturally linked to culture, society and public attentions. To a certain extent, film is not only a reflection of public desires and social thoughts, but also a guide to influence them. It seems that unreal film cannot directly change people’s mindset or impact the social development, but it can affect people’s view of things subtly, especially those epidemic films. In the history of American films, the images of black people are changing with the time pace and present different characters on the screen. Therefore, it is valuable to discuss the relationship between the change of American social environment and the change of black images in American movies.
　　After the great voyages movement of the 15th century, western colonialists used to plunder on African continent and American continent. The slave trade had been launched for hundreds