Would a national language be unifying / disunifying?

[oldhippie]

69. It is amazing ....

My wife's granddaughter in Taipei speaks and writes almost perfectly grammatically correct English. I almost never catch her in a grammar error. She can also use "texting slang" on facebook or text messages just like an American teenager. She is 19 and now a freshman at Michigan State University.

She and her brother were here visiting the US in August for three weeks before she went to Michigan. The boy is just 11 years old, but had a pretty good grasp of English. He doesn't like to talk much yet, but you could tell he understood a lot of what was being said. He is now back in Taipei but we also chat on facebook or Skype almost every day and he is using typical teenager textspeak.

In Taiwan all students study English from first grade on to graduation.