Ethnostates? Perhaps. But Without Federalism? No

If the members are given the liberty of states rights, federalism (like empires) can keep the peace, otherwise states do war against one another, as history has shown, time and again. With states rights, variety and freedom are vital for evolution, but economic nationalism and national defense are vital advantages of federalism. If followed, the United States Constitution is a great document for separating the powers while keeping them lightly united.