The Crowdsale used mostly Chinese exchanges, but Allcoin.com is Canadian.

The sale was not available to USA participants, but even then, Poloniex said they do not host Crowdsales anymore.  Bittrex has a clause that they need to be the exclusive exchange for any sale. This is 2 major reasons it could not be hosted there.

Another reason is there is a lot of support for Qtum in China.