France, July 19 -- From closed-door conferences in Paris to policy summits in Madrid and Warsaw, US-style nationalism, championed by Donald Trump's allies, is gaining ground in Europe - raising urgent questions about the future of democracy on both sides of the Atlantic.

On 26 May, the Heritage Foundation, the influential United States conservative think tank, chose Paris as its platform to speak to Europe.

Kevin Roberts, the foundation's president, delivered a keynote address at a closed-door gathering of European nationalists and conservatives, stressing unity against "globalist institutions" and a desire for "sovereign cooperation" over centralised governance.

One day later, the US State Department's Substack channel published an ar...