What happened when the establishment of a boundary between British columbia and Alaska came about?

I have no idea! But I can use Google and read lots of articles to find out.

http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=boundary+between+alaska+and+canada

and

http://www.google.com/search?q=boundary+between+alaska+and+canada&hl=en&prmd=ivnsb&source=lnms&tbm=isch&ei=4jKzTbbwG4S2tgfSgNHpDg&sa=X&oi=mode_link&ct=mode&cd=2&ved=0CBMQ_AUoAQ&biw=1024&bih=481

Just look at those landscape photos. If you were out in the middle of those areas, would you know where the boundary is? If so, how?

A territorial dispute came about. Oh so they couldn't see where the boundary was, and therefore were fighting over the land.

That's right.

Anything else? Like was that the only reason?

That's not the only reason. Didn't you read any of the articles in the first Google results above??

They were arguing over trading territories.

Right