Canada, a nation of not quite 37 million people, wants to add more than 1 million immigrants through 2021. "Thanks in great part to the newcomers we have welcomed throughout our history, Canada has developed into the strong and vibrant country we all enjoy," Ahmed Hussen, minister of immigration, refugees and citizenship, wrote in an annual report to Parliament. "Immigrants and their descendants have made immeasurable contributions to Canada, and our future success depends on continuing to ensure they are welcomed and well-integrated." Hussen, now in his early 40s, fled to Canada from war-torn Somalia when he was 16. A...