You're right, my point was more that there exists some states that look like Austria/Germany, and some states that look like Denmark. The existence of a bicamer

You're right, my point was more that there exists some states that look like Austria/Germany, and some states that look like Denmark. The existence of a bicameral legislature was more a reference to the self-governing nature of the states (which have executive branches, constitutions, and judiciaries). Which is all to say: the US is more similar to the EU than it is to any one of its individual member states.