This collection of essays suggests that the E.U. and U.S. are both cases of modern federalism at the empire political-level and scale. Distinct attributes and dynamics apply, which do not apply at the state level. Unfortunately, too often today, people treat a state in one union as equivalent to the other union rather than to one if its own states. This category mistake ignores vital differences, and thus is apt to result in sub-optimal public policy and even governmental design. To be sure, each union faces its own risks--dissolution being a threat for the E.U. and consolidation for the U.S. Though correcting for the passage of time, dissolution is/was a risk for both the early E.U. and the early U.S. Such a basis of comparison is optimal. Americans and Europeans can indeed learn from each other, with more perfect unions resulting.
The book: Essays on Two Federal Empires