OTTAWA—Prime Minister Justin Trudeau unveiled his diverse, gender-equal cabinet to the country by strolling to Rideau Hall with his family and ministers amid waves of applause from thousands of Canadians. Trudeau's cabinet is the first in Canadian history with equal numbers of men and women, the first ever Muslim minister, the first aboriginal justice minister, and the first northern fisheries minister, an Inuit who wore a sealskin tie to take his oath. Flanked later outside by his 30 ministers, a buoyant Trudeau addressed a throng of about 3,500 people as Canada's 23rd prime minister. He said it was an "incredible...