On the US:<p>The USA is ancient compare to the EU. The EU&#x27;s first days were debated on the internet. The US&#x27; were debated by pamphleteers, distributed on horseback and had slavery as a side issue midway down a list of policy questions to debated later.<p>Could you imagine The US expanding its union? Could you imagine Mexico joining, the constitution being re-written?<p>I don&#x27;t think we&#x27;re bounded by what the US is or has done. Even the US isn&#x27;t. Times change.<p>On exits<p>I don&#x27;t think that option would be taken very often. (A) It would pressure the EU to be what it needs to be, a Union countries want to be a part of. (B) It would change the local political debate. At the moment, the anti-EU Trump^ can safely talk without it meaning anything. I think the EU should be built to withstand border changes, in both directions.<p>^Interesting how rarely EU politics is debated on HN compared to US politics. Hello brothers from across the Atlantic.