What confuses me most is the why chose American English? Considering that British English is already a working language of the EU, why go for a new one? That'

What confuses me most is the why chose American English? Considering that British English is already a working language of the EU, why go for a new one? That's just going to mean more work. If you are going to promote efficiency, a continuation of what we already have (that works) should be the goal, not open a whole other can of worms.