I think we all know what nationalism is. It has been with us much longer than pluralism. Unfortunately, nationalism is also much more common than pluralism.
Nationalism is usually considered an ideology which emphasizes loyalty to a particular nation. It can be a force for good. Often it is a force for bad. It often promotes devotion to one’s own country above all. The lates strong iteration of it, is the MAGA movement in the US. Make America great again. Or for those who already think it is a great, make it greater. America First would be a more important principle for American nationalists. When it leads to feelings of superiority it has usually gone too far. A strong love of one’s own country is a natural feeling and unobjectionable. But feelings of superiority are often unjustified and not very productive.
Pluralism is the recognition and affirmation of diversity within a society, where different groups, interests, and beliefs coexist and interact peacefully. It sees strength in diversity which all can benefit from. It not only tolerates diverse views, and even peoples, it celebrates in diversity. Respect of other cultures is essential to the philosophy of pluralism. Feelings of superiority are an anathema. Nationalism can be a fierce opponent of pluralism. In such a case, in my view, nationalism has gone too far. Pluralism is incompatible with extremism. You can one but not both. Pluralism is born out humility.
The struggle between nationalism and pluralism is often fraught. For example, recent examples close to home, are the relationship between Quebec and its separatists, who want to form the independent, or sovereign nation, as they like to call it, of Quebec. In Canada, Alberta is the latest example of where feelings are tending towards separation. How far those feelings will lead that province are not known.
In Yugoslavia feelings of pluralism were swamped by nationalism, except in those states where a yearning for separation by smaller groups prevailed. After their leader Tito died, many Croats wanted to have Croatia secede from Yugoslavia. At the same time, Serbians within Croatia did not want to secede because they felt they would become a minority in the new country, when they had been a majority in power in Yugoslavia. As well, some Slovenians wanted to secede from Yugoslavia, and that was opposed by the Croats within as well as Serbians.
The struggle for separate national states often leads to serious political problems. It can, and has, frequently led to serious conflict. Around the world people have come to favor nationalism at the expense of pluralism. That is usually a serious mistake. In the former Yugoslavia after the death of Tito, clearly nationalism had the floor. Pluralism seemed dead. Croatia, Slovenia, Bosnia, and Kosovo, all wanted to be sovereign states even if violence was the only way to achieve it.
There was no credible force for pluralism. I often quote William Butler Yeats who described this phenomena well: The best lack all conviction while the worst are filled with passionate intensity.” Serbia claimed to be the leader for unity of the states, but all the others lacked confidence that its claims were not based solely on its interest in dominating the other states. No one argued for all for one and one for all that is the precondition pluralism requires.
Pluralism was dead; war of all against all commenced. And the people suffered.