I have postulated elsewhere, contemporary ructions within EU member states as well as evolution and adoption of EP authorities is analogous to historical establishment of a strong central government bureaucracy and common currency among the USA, culminating in a notorious civil war here. Several european politicians have denied this analogy, "United States of Europe". Nonetheless, here you --as well as innerboob spectators in the USA -- feebly grappling competition among signatories to retain "sovereignty" while a bloodless political revolution ripens. The US gov't required some 100 years and trillions of US Treasury income tax authority and revenue, distributed as block grants ("incentives") among the sovereign states, to obviate "consensus" among states' legislators (10th Amd.). The EP is but 30-years-old.
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in review, you may evaluate and anticipate controversy within EU social structures as I do from some perspective on perfect unions, not addressed from black histories of "civilization".