Canada has become a founding member of the Trans-Pacific Partnership, a 12-country trading block that will enjoy a significant drop in tariffs nearly across the board while fundamentally changing the nature of the North American auto industry and nudging Canada’s supply-managed agricultural sectors towards greater international trade.

Conservative Leader Stephen Harper says the historic deal protects Canadian jobs today and creates more for generations to come as it secures access to hundreds of millions of new customers in the Asia-Pacific region.

But it won’t please everyone.

“This deal is, without any doubt whatsoever, in the best interests of the Canadian economy,” Harper told a news conference Monday after the deal was announced.