What would the world look like now if the 13 colonies wasn't rebelled

There wouldn't be a USA, and...

the Indians would still have pretty much all of the Middle-west of the USA.
Hawaii would still be under their kings/queens
Alaska would still be part of russia
China would pretty much never had any technological progress (they isolated themselves)
Japan would still be going around with pretty much katanas.

etc etc

if you want more i can give you more (if you want information on why one is on the list, post it in the comments)

hope this helps