Large groups of culturally homogeneous people, by definition called "nations" (like Quebec, a "nation within a nation"), naturally yearn for self-determination. They have their owns wants and desires, and to live how they want to live and enjoy and maintain their culture without government interference. When 2 or more large groups of cultures live within the same country and one of those cultures feels they lack this self-determination and feel they are being controlled by another powerful group, this group becomes disenfranchised and this often causes political/social conflict within countries and has caused many civil wars or threats of wars or separation, here are only some examples:
- Quebec vs rest of Canada, aboriginals vs rest of Canada, Scottish and Irish vs Britain, the Balkans, Israelis vs Palestinians, Hindu Indians vs Muslim Pakistanis vs Muslim Bangladeshi's vs Sikh Punjabi's, Tutsis vs Hutus in Rwanda, Shia vs Sunni Muslims across the ME, US north vs US south (in 1800's), the Nazi holocaust, Muslim minorities in China, war in Darfur in Sudan, Coptic Christians in Egypt, Christians vs Muslims in Lebanon etc.
People wanting to change our entire international system of sovereign nation-states, and have well-meaning but naive utopian dreams of a borderless world fail to understand these cultural power dynamics. Sovereignty and national self-determination is the entire legal basis of the international system of nation-states that was created with the Treaty of Westphalia in 1648, it's the fundamental basis for our international system. So much so that it's enshrined in the UN Charter.
All countries are nation-states. Trudeau thinks Canada is first "post-national state", and is somehow be immune to internal cultural conflict (Quebec & aboriginals & Western alienation says otherwise). He dreams of a world & a country where all diverse peoples can get along and live peacefully with one another. It's an honourable dream, but given history and the different conflicts around the world & in Canada it is naive to think this way. That's why the integration of different cultures and migrants within Canada must be done VERY carefully, which it's not.
A post-national state is a road straight towards the gathering of competing sub-national political groups (like Quebec), very dangerous for social cohesion. We all need to feel like we are all "Canadian", we all need to feel like we're part of the same "in-group" even if we have some differences, and we all need self-determination.