Skilled Workers America’s best friend and oldest trading partner—that’s Canada. Happy member of the world’s largest free trading zone? Sure. But when it comes to the global competition for talent, well, friendship only goes so far. When immigration managers at Canada’s consulate in Los Angeles were asked last year to provide a snapshot of the immigration situation in their region, their tone sounded downright predatory. “Significant numbers of high quality economic class immigrants are being gleaned...