To be fair, every country and every trade bloc prioritises its own interests
The Uk is in the vulnerable opposition of leaving its regional trade bloc, when for years the other countries in the world have been strengthening ties to their regional trade partners
At least those countries that are not as big as the US, China & India are doing so
As the trade wonks keep telling us, geographical proximity has a big influence on how much trade is done
So does common regulation and the removal of NTBs (non-tariff barriers), enabling more "frictionless" trade
Hence the growth in regional trade blocs
The EU is the most integrated trade bloc in the world and other trade blocs are copying this integration