There is a EU law(such GDRP) that all member states must transpose into their state legislation. A citizen of a "foreign" member state enjoys the same rights as

There is a EU law(such GDRP) that all member states must transpose into their state legislation. A citizen of a "foreign" member state enjoys the same rights as the "local" citizen. The point if EU is/was to achieve an "ever closer union" so that war between European states would never happen again. It's not just an economic bloc. Btw the immigration is the main issue which has nothing to do with trading.