The skyline seen in 2019 of Macau, the semi-autonomous Chinese territory with a thriving casino industry where the United States has voiced alarm over human trafficking - Copyright AFP/File Eduardo Leal The United States on Tuesday added Vietnam, Cambodia, Brunei and Macau to a human trafficking blacklist that already counts Malaysia, alleging weak efforts to stop forced sex work or assist migrant laborers. In an annual report, the United States also added authoritarian-ruled Belarus to the blacklist and, in a rare criticism of a Western ally, put Bulgaria on a watchlist over concerns it is not taking trafficking seriously. “If...