In order to figure out what nationalism is all about, we must firstly ask ourselves what does nation mean. Nation is an elusive concept, as all abstractions are, that defines a unified imaginary community in which an elite is chosen to speak on behalf of the people but don´t recognise the role of the less privileged or opposing views in order to convey that image of unity it is based upon.

The sense of national belonging is forged by the exclusion or denigration of others and the nationalist discourse uses several mechanisms to try and create that delusional sense of belonging. The nation, as a myth, needs to create that feeling of belonging to something greater than oneself and does it by resorting to symbols, to a common culture, to language and traditions, as well. Also, race and ethnicity are typically used to set the limits of the nation by discriminating individuals on the ground of physical features, positing boundaries that establish who can or cannot belong to the nation according to certain parameters. Racial difference is socially and discursively constructed and used for particular porpuses within nationalism. According to Etiènne Balibar there are two main forms of racism; external racism, which involves the discrimination of those who live outside the border on the grounds of race and internal racism which discriminates those within the nation not deemed to belong to an imagined community by keeping them in a subservient position in society or, in some cases, by their extermination.

There are several well known examples of the use of race and ethnicity for privileging one racial group as the nation’s true people as a strategy to build the myth of the nation.

• We can all recall the genocide in Rwanda, grounded on ethnicity, in 1994: the mass slaughter in Rwanda of the ethnic Tutsi and politically moderate Hutu peoples. Some estimates claim that anywhere between 500,000-1,000,000 were murdered, along with thousands of Tutsi sympathizers, with another 2 million refugees in neighbouring countries. These kinds of conflicts based on ethnicity are not rare in those countries who inherited their borders from the colonising countries, given that withing those borders many different ethnic groups, different cultures and religions can be found.

• In the Basque Country, Sabino Arana and others based their nationalist discourse on some theories which established the Basque physical and genetic features, such as the fact that the Basques possessed the highest global apportion of the Rh- blood types, or that they had certain craneal and physical features. These theories were also supported by authors such as the geneticist L. Luca Cavalli Sforza, who stated that the Basques were the descendants of the Cro-Magnons, and served to build a sense of exclusive national identity which was used by Basque politician Xabier Arzalluz in 1993, not that long ago.
• Hitler intended to foster an Aryan Germany by the extermination of other ethnic groups and those he considered defective and undertook the Lebensborn project,  a state supported association in Nazi Germany with the goal of raising children of persons classified as “racially pure and healthy” as based on Nazi ideal ethnicity.

Sources:

Beginning Postcolonialism – McLeod

http://www.worldwithoutgenocide.org