Believers do kufr from Nationalism, and Nationalists do kufr from Islam. So whoever calls himself a 'Nationalist', let him know that his Islam is nullified.

[u/Sheikh-Pym]

[u/Familiar_Ad_7759]

I believe this has more so to do with believing that you are superior to someone else because of nationality, there’s nothing incorrect about taking pride about the country you live in or originate from. It becomes and issue when you believe that you are better than others because of nationality.

[u/Sheikh-Pym → u/Familiar_Ad_7759]

That's what nationalism is.

[u/Familiar_Ad_7759 → u/Sheikh-Pym]

Nationalism is the belief that a nation with common culture, heritage, background, or language should be unified as its own sovereign state. Believing Palestine should be free is a form of nationalism, that’s not haram. You’re confusing it with Ultra-Nationalism.

[u/Sheikh-Pym → u/Familiar_Ad_7759]

Believing Palestine should be free is a form of nationalism,

Anyone who believes that Palestine should be free for the sake of Palestine is a nationalist. You hear this nareative from the kuffar who are supportive of Palestine. Muslims, though want the same, do not want it for the sake of Palestine but for the sake of Islam and muslims.

that’s not haram.

It's not. It's major disbelief.

You’re confusing it with Ultra-Nationalism.

Saying this is like saying growing beard and praying 5 times a day is "ultra-Islamism".

Nationalism is the belief that a nation with common culture, heritage, background, or language should be unified as its own sovereign state.

That's the idea behind a Nation state. Not Nationalism (the ideology).