Johannesburg — President-elect Donald Trump talked tough on China during his campaign, vowing to impose higher and sweeping tariffs on imports from the Asian giant. Beijing will now also be closely watching the incoming administration’s movements further afield, in Africa, where U.S.-China rivalry is high. Experts disagree on what a second Trump term will mean for Beijing’s ambitions on the continent, with some saying it could be a boon for China – Africa’s biggest trade partner – if the U.S. pursues an isolationist, “America First” agenda that mostly ignores the region. But Tibor Nagy, who served as Trump’s Assistant Secretary