Critical discourse methodology is an extremely significant and meaningful branch of systemic functional linguistics which pays more attentions in the formation,diffusion,and acceptability of acertain discourse,and also the investigation on social background;meanwhile it is always used to discuss and pin down those familiar perceptions and ideologies that have been overlooked by the public so that new re-examination can be carried out to dig out some other attractive points.In this paper some basic theoretical basis and methodologies will be explained and then,by applying the critical discourse analysis,the slogans in the protests from Minneapolis to the whole America.Racial discrimination has invariably been a severe social problem for more two centuries in the U.S.A.After the Emancipation Proclamation by Abraham Lincoln,157 years has passed;however this kind of serious social issue still haunts among every American people.Countless protests have happened in the development of America;thus by analyzing the different types of slogans in this recent protest,novel discovery and meaningful retrospect would emerge.
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