As computers are being used more and more in education, there will be soon no role for teachers in the classroom

Today a lot of different cultures and ethnic groups live together in one country. Why is this so and do you think is a positive or negative development?
In our developed world it is impossible to find a country where lives only one nationality. There are at least 10-15 ethnic groups gathered in one country. If I do not make a mistake, this is one of the effects of wars which were held between impairs or kingdoms. In my essay I will show negative and positive development of this statement.
Some people argue that, being neighbors with other nationalities is not so good idea, because it can be a reason for the disagreements between them. A food which prefers one neighbor can be opposite to the religion of another one. Moreover, even black and white people live together in some countries there is still discrimination between them. These kinds of people believe that everybody should live in their own area. For instance, blacks should live in Africa or Australia, whites in Canada, USA or in Europe and mongoloids should live in Asia. Of course this kind of sum is not right and not honorable.
Other people think that living in touch with different cultures and many ethnic groups is very interesting. During their live they can learn a lot from each other. For example, traditional parties, foods, hobbies etc. I really believe that this is amazing, because changing experiences and getting some new and useful knowledge about anything is very fascinating. These kinds of people are friendly and enjoy living in neighborhood with other nationalities. Moreover, they do not know what discrimination is and do not care about the religion and tradition of their neighbors.
In my opinion, there is no negative development, because different nations can teach us such kind of things that we can not find them on books. Besides, we can learn language of other countries and we can visit them. For instance, I want to improve my English, therefore I have to speak with the man o woman who knows English, otherwise I can not speak clearly and flatly this language even if I know the grammar and many words. Practice is one of the most important things in learning language. Furthermore, in abroad people find a thing which they can not find in their birthplace. There is a saying; my home is there where I feel myself better.
To sum up, positive sides can easily cover negative sides of living together with other ethnic groups and nationalities. We can not change anything, because the root of it is very strong and deep. The thing that we can do is only to hold a peace between different cultures and our nationalities.