I get why you do so, but the European Union is always shortened to EU, not UE. It would be as if I wrote a sentence, "The EWG was created by the treaty of Rome

I get why you do so, but the European Union is always shortened to EU, not UE. It would be as if I wrote a sentence, "The EWG was created by the treaty of Rome in 1957". What is EWG? Oh yes its the German abbreviation for the EEC. But we're writing in English?