What Is the Treaty of Herabia?

The treaty of herabia teaches us that it is allowed for moslems to have different political treaties. What might be allowed one group is not allowed for another. And we also make a distinction between those who are and raised here, where do even more so, where you expect them to go? Even more so, what nationality do they have? Which land will take them?What is to happen to 50 million moslems?