Imperialism is what keeps the global north from aligning with the interests of the global south, and is what keeps the global south underdeveloped and overexploited. Your arguments about imperialism not being impactful in the modern day are hollow, considering its the driving force behind every major war and geopolitical issue, it's the primary contradiction. An argument against nations on moral grounds, without questioning why and how they form, doesn't actually explain how we end them.