why does racial discrimination exist in USA?

why does racial discrimination exist in USA?
如题,200字 英文
说明美国为什么会有种族歧视.

American racial discrimination dates back to European slave trade period.A report on human rights situation in the United States issued on Thursday said that racial discrimination is a deep-rooted social illness in that country as blacks and other minor ethnic groups are living in the bottom of the American society
1.Race should not be distinguished by fit and unfit quality,but social development should be distinguished by fast and slow speed.When a nation’s civilization is higher than another nation’s,the former will have a feeling of superiority over the latter.This is one of the main causes of human historical racial discrimination.Cultural、historical and political factors are the sources of American black racial discrimination.In the social class country,the discriminatory problem is also the social class problem.When a class is higher than another class,there must be some conflits and contradictions,as well as other series of problems.As the time goes by,it must form discriminatory problems.In essence,this kind of racial discrimination is kind of despising upon the inferior community and culture.In the long history,due to high productivity,the white community’s civilization is definitely higher than the others.The superior psychology of the White contributes greatly to racial discrimination.More specifically,when two different cultures confront with each other,the dominant culture necessarily judge the weaker culture according to its own measure,thus producing discrimination.To some extent,I regard it a concept of self-centered.
2.In my opinion,regardless of American black or other colored people like non-lineage American、Latin lineage American and Spanish lineage American,they are suffered from discrimination,partly because of jealousy.The higher people’s social class status is,the more narrow their hearts are,which it is the same as Jews masscured by German.Because Jews are very rich and clever,which is envious conditions,but some people show it in a radical way.Racial prejudice is forming an opinion about someone,before getting to know him personally,based on his race.Racial prejudice causes one to prefer his own race to others and discriminate against others in favour of his own.Racial prejudice is attaching a particular characteristic to all the members of a racial group because one or a few of them have it.Racial prejudice is caused by blind imitation of the past.Lo and behold,there is a group of people superior to all others.They who are superior to all others are the lovers of humanity,of whatever colour,class,or creed they may be.
3.The living conditions and educational level of black people are far lower than Causasian,causing vicious circle and enlarging the distance.The discriminatory thought is deep-rootd in American mind,referring to many aspects of social life.According to the statistics,the number of black people living under low-income level is three times more than the white.The average life of black people is six years old less than the Causasian.The record points out that minorities in America are discriminated in getting jobs and careers.American racial biases cause the social contradiction intensified and the number of hatred crimes increasing.In Nov.2006,the unemployed rate of American black is 8.6%,wheras the white’s is 3.9%.The disparity of educational aspects between the colored people and causasian tends to enlarge.In America,over half of male in minority can’t graduate from high school.67.5% of Latin lineage and 53% of African lineage stop going on education after graduation from high school.The Causasian obtain university educational background or professional technological certificate more easily than the African lineage and Latin lineage.Thus it can be seen that the segregation in education becomes more serious.