Texas

I'm in Germany and have been watching the Brexit machinations.
Country borders cause trade friction unless you have a trade agreement like being an EU member.
Some small companies have stopped their export business to the EU because of regulatory compliance costs. Then all goods coming from Texas would have to meet US standards, including food items, be subject to checks at border crossings, probably WTO* tariffs unless negotiated lower.
Large financial companies in England set up offices in the EU to make their business easier. They would have to negotiate trade agreements with every country or trade group, EU, or operate under WTO rules.
Manufacturing would have to make widgets to any new Texas standards, and get export ones made to US standards. These empty cowboy hats don't have a farting clue.

* WTO. World Trade Organization