There are, unfortunately, only a handful of airports outside the US where you can pre-clear customs and immigration:

15 Preclearance locations in 6 countries: Dublin and Shannon in Ireland; Aruba; Bermuda; Abu Dhabi in the United Arab Emirates; Nassau in the Bahamas; and Calgary, Toronto, Edmonton, Halifax, Montreal, Ottawa, Vancouver, Victoria, and Winnipeg in Canada.

I used Dublin and Ottawa last year. Made my connections a breeze! I wish there were more of them.