How can we make nationalism serve rather than damage relationship?

We (citizen or government) should not try to everything to ban the flow of foreign immigration but we want it to be legally. It is also important for us to understand about the important of diversity. So what does diversity mean? 

Diversity refers to the state of being diverse or different. This could count into the account with the dimension of gender, ethnicity, race, sexual orientation, socioeconomic status, religious beliefs or other ideologies. 

I think we people in Cambodia or some other Asia countries when hear the word 'Diversity' we would fear about the problem of social disorder, losing our own culture, language or religion. This is worth to worry about the problem of social disorder but not to over worry about losing culture, language  or religion. Take a minute to think what is culture, what is language, and what is religion? Does all of these make us a real and hundred percent Cambodian? 

The UNDP's press release says unambiguously that "there is no evidence that cultural diversity slow development", and dismisses the idea that there has to be a trade-off between respecting 
diversity and sustaining peace. Some of the world's richest and most peaceful countries are historically multi-ethnic, such as Switzerland, Canada, and Belgium. And most of the world's richest countries are now the destination of immigration from around the world, making America, Britain and other wealthy nation hugely diverse. 

To make our nationalism inside us more beneficial is to promote the culture of our country to our neighbouring country or the world, if possible. We should not think that there purification nation in one particular country because it impossible to have on person that have pure blood of their nation. We can actually produce films, music, or any events. As a good example in Cambodia, we can surly see foreigners specially from Japan. They try to promote their culture to Cambodia by organising the events and invite youths to join. 

That's how they use their nationalism in a peaceful way without harming others people. It gives benefit a lot to Japanese such as building the relationship between Cambodia and Japan, and promoting their culture as well.

Japan has the world's third-largest economy by nominal GDP and the world's fourth-largest economy by purchasing power parity. We can see they are the develop country but they still love their culture, so the important point is to know how to use nationalism in a standard level and in a good purpose without harming other nation. It is also important to understand the other's nation that they have their own right to live and they also have feeling. They can be hurt when we discriminate or judge them and we have to keep in mind that we all are human being.

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