The "One China" policy—whereby the US maintains formal relations with Beijing and not Taiwan—has been the cornerstone of US-China relations for decades. It was upended within one month of Donald Trump’s victory, when the then president-elect accepted a phone call from Taiwanese President Tsai Ing-wen. Further statements from the Trump administration suggest that questioning the "One China" policy may no longer be taboo. On the heels of the 45th anniversary of the 1972 Shanghai Communique—which marked the beginning of the rapprochement of US-China relations—what does the Trump presidency portend for US-China relations and the fortunes of Hong Kong and Taiwan? Could Taiwan be part of a bargain between the US and China? How would Hong Kong fare in the event of a possible Sino-US trade war?